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Men's Ridgeline Base Layer Top

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Size
Size chart
MEN'S SHOES MEN'S TOPS MEN'S BOTTOMS WOMEN'S SHOES WOMEN'S TOPS SPORTS BRAS WOMEN'S BOTTOMS WOMEN'S
OUTDOOR BOTTOMS MISSION PANT MISSION JACKET OP TOP / OP TOP PRO (S/S) OP TOP / OP TOP PRO (L/S) OP ASSAULT PANT
INCHES CM
U.S + CA MEN'S 8 8.5 9 9.5 10 10.5 11 11.5 12 13 14
UK MEN'S 7 7.5 8 8.5 9 9.5 10 10.5 11 12 13
EU MEN'S 41 41.5 42 42.5 43 44 44.5 45 45.5 47 48.5
U.S + CA WOMEN'S 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11
UK WOMEN'S 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5
EU WOMEN'S 36 37 37.5 38 38.5 39.5 40 40.5 41.5 42 42.5 43 43.5
US/CA UK EU
8 7 41
8.5 7.5 42
9 8 42.5
9.5 8.5 43
10 9 44
10.5 9.5 44.5
11 10 45
11.5 10.5 45.5
12 11 46
13 12 47.5
14 13 48.5
SIZE SMALL MEDIUM LARGE X-LARGE 2XL 3XL
SLEEVE LENGTH 9 1/4” 23.5 cm 9 1/2” 24.1 cm 9 3/4” 24.8 cm 10” 25.4 cm 10 1/2” 26.7 cm 11” 27.9 cm
BODY LENGTH (FRONT) 28” 71.1 cm 29” 73.7 cm 30” 76.2 cm 31” 78.7 cm 32” 81.3 cm 33” 83.8 cm
CHEST WIDTH 20 3/4” 52.7 cm 21 3/4” 55.2 cm 22 3/4” 57.8 cm 23 3/4” 60.3 cm 24 3/4” 62.9 cm 25 3/4” 65.4 cm
BICEP WIDTH 6 1/2” 16.5 cm 6 3/4” 17.1 cm 7” 17.8 cm 7 1/4” 18.4 cm 7 1/2” 19.1 cm 7 3/4" 19.7 cm
SIZE SMALL MEDIUM LARGE X-LARGE 2XL 3XL
SLEEVE LENGTH 24 1/2” 62.2 cm 25” 63.5 cm 25 1/2” 64.8 cm 26” 66.0 cm 26 1/2” 67.3 cm 27” 68.6 cm
BODY LENGTH (FRONT) 28” 71.1 cm 29” 73.7 cm 30” 76.2 cm 31” 78.7 cm 32” 81.3 cm 33” 83.8 cm
CHEST WIDTH 20 3/4” 52.7 cm 21 3/4” 55.2 cm 22 3/4” 57.8 cm 23 3/4” 60.3 cm 24 3/4” 62.9 cm 25 3/4” 65.4 cm
BICEP WIDTH 7” 17.8 cm 7 1/2” 19.1 cm 8” 20.3 cm 8 1/2” 21.6 cm 9” 22.9 cm 9 1/2” 24.1 cm
MEASUREMENT 30 32 34 36 38 40 42
HIP 18 1/4” 46.4 cm 19 1/4” 48.9 cm 20 1/4” 51.4 cm 21 1/4” 53.9 cm 22 1/4” 56.5 cm 23 1/4” 59.0 cm 24 1/4” 61.6 cm
THIGH 11 1/4” 28.6 cm 12” 30.5 cm 12 3/4” 32.4 cm 13 1/2” 34.3 cm 14 1/4” 36.2 cm 15” 38.1 cm 15 3/4” 40.0 cm
KNEE 9” 22.9 cm 9 1/2” 24.1 cm 10” 25.4 cm 10 1/4” 26.0 cm 10 3/4” 27.3 cm 11” 27.9 cm 11 1/2” 29.2 cm
BOTTOM OPENING 8” 20.3 cm 8 1/4” 21.0 cm 8 1/2” 21.6 cm 8 3/4” 22.2 cm 9” 22.9 cm 9 1/4” 23.5 cm 9 1/2” 24.1 cm
INSEAMS 30" / 33" / 36” 76.2 cm / 83.8 cm / 91.4 cm 30" / 33" / 36” 76.2 cm / 83.8 cm / 91.4 cm 30" / 33" / 36” 76.2 cm / 83.8 cm / 91.4 cm 30" / 33" / 36” 76.2 cm / 83.8 cm / 91.4 cm 30" / 33" / 36” 76.2 cm / 83.8 cm / 91.4 cm 30" / 33" / 36” 76.2 cm / 83.8 cm / 91.4 cm 30" / 33" / 36” 76.2 cm / 83.8 cm / 91.4 cm
SIZE CHEST WAIST ARM LENGTH
XS 34-35" 86-89 cm 28-30 24-25
S 36-37" 91-94 cm 28-30 25-26
M 38-39" 97-99 cm 29-33 25-26
L 40-41" 102-104 cm 32-35 25-26
XL 42-43" 107-109 cm 34-37 26-27
XXL 44-46" 112-117 cm 36-39 26-27
3XL 47-49" 119-124 cm 40-43 26-27.5

MEASURING TIPS:

For the most accurate measurements, we suggest measuring as close to the skin as possible.

CHEST MEASUREMENT:

Wrap the measuring tape around the widest point of the chest starting at the front and center of your torso.

WAIST MEASUREMENT:

Measure around the body where the waistband of your pants normally sits.

ARM MEASUREMENT:

Measure from where the shoulder connects to the arm and down to wrist.

SIZE WAIST HIP THIGH INSEAM (SHORT) INSEAM (REG) INSEAM (TALL)
S 30 38.5-41.5" 98-105 cm 25.5-28" 65-71 cm 30 33 36
M 32 40.5-43.5" 103-110 cm 26.5-29" 67-74 cm 30 33 36
L 34 42.5-45.5" 108-116 cm 27.5-30" 70-76 cm 30 33 36
XL 36 44.5-47.5" 113-121 cm 28.5-31" 72-79 cm 30 33 36
2XL 38 46.5-49.5" 118-126 cm 29.5-32" 75-81 cm 30 33 36
3XL 40 48.5-51.5" 123-131 cm 30.5-33" 77-84 cm 30 33 36
4XL 42 50.5-53.5" 128-136 cm 31.5-34" 80-86 cm 30 33 36
5XL 44 52.5-55.5" 133-141 cm 32.5-35" 83-89 cm 30 33 36

MEASURING TIPS:

We have determined that your waist measurement will most likely dictate your size. Secondary to waist size, if you notice your thighs exceed the limit on our chart you may need to go up a size.

THIGH MEASUREMENT:

Measure around the widest area of the thigh.

HIP MEASUREMENT:

Measure around the largest area of your hips, encapsulating the roundest part of your gluteus.

U.S + CA WOMEN'S 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11
UK WOMEN'S 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5
EU WOMEN'S 36 37 37.5 38 38.5 39.5 40 40.5 41.5 42 42.5 43 43.5
U.S + CA MEN'S 8 8.5 9 9.5 10 10.5 11 11.5 12 13 14
UK MEN'S 7 7.5 8 8.5 9 9.5 10 10.5 11 12 13
EU MEN'S 41 41.5 42 42.5 43 44 44.5 45 45.5 47 48.5
US/CA UK EU
5 2.5 35.5
5.5 3 36
6 3.5 36.5
6.5 4 37.5
7 4.5 38
7.5 5 38.5
8 5.5 39
8.5 6 40
9 6.5 40.5
9.5 7 41
10 7.5 42
10.5 8 42.5
11 8.5 43
SIZE CHEST WAIST ARM LENGTH
XS 28-31" 71-79 cm 24-27 20-22
S 30-33" 76-84 cm 27-30 21-23
M 34-36" 86-91 cm 30-33 22-24
L 37-39" 94-99 cm 33-35 23-25
XL 40-42" 102-107 cm 35-37 23-25
2XL 42-44" 107-112 cm 37-39 23-25
1X 44-47" 112-119 cm 40-42 23-25
2X 47-50" 119-127 cm 42-44 23-25
3X 51-54" 130-137 cm 44-46 23-25

MEASURING TIPS:

For the most accurate measurements, we suggest measuring as close to the skin as possible while wearing a non-padded, non-compression bra.

CHEST MEASUREMENT:

Wrap the measuring tape around the widest point of the chest starting at the front and center of the torso.

WAIST MEASUREMENT:

Measure around the body where the waistband of your pants normally sits.

SIZE 28 30 32 34 36 38 40 42 44 47
A XS XS S M L L XL - 1X 2X
B XS XS S M L XL XL - 1X 2X
C XS S S M L XL XL 2XL 1X 2X
D S S M M L XL 2XL 2XL 2X -
DD S S M L XL XL 2XL 1X 2X -
E - M M L XL 2XL 2XL 1X 2X 3X
F - - - - - - - 1X 2X 3X
G - - - - - - - 1X 2X 3X

MEASURE YOUR RIB CAGE:

Measure around your rib cage just under your bust. Round down to the closest inch. This is your rib cage measurement, which you’ll need to figure out your band and cup size.

FIGURE OUT YOUR BAND SIZE:

Take your rib cage measurement from step 1 and read across the chart below to find your band size.

SIZE BUST
XS 28-31" 71-79 cm
S 30-33" 76-84 cm
M 34-36" 86-91 cm
L 37-39" 94-99 cm
XL 40-42" 102-107 cm
2XL 42-44" 107-112 cm
1X 44-47" 112-119 cm
2X 47-50" 119-127 cm
3X 51-54" 130-137 cm

FIGURE OUT YOUR CUP SIZE - THIS IS A 2-STEP PROCESS:

First, measure around the fullest part of your bust. Keep the tape straight across your back. Round up to the nearest whole number. This is your bust measurement.

Now, subtract your rib cage measurement (step 1) from your bust measurement (step 3). The difference in inches is your suggested cup size. If you’re between sizes, round up.

BUST SIZE MINUS RIB CAGE SIZE YOUR CUP SIZE
3" 7.6 cm AA
4" 10.2 cm A
5" 12.7 cm B
6" 15.2 cm C
7" 17.8 cm D
8" 20.3 cm DD
9" 22.9 cm E

FIT GUIDELINES:

Every bra serves a different purpose for different activities and we recommend referencing each specific bra product description to determine the best bra for your body and sport. Our bras should generally fit snug. Wearing the bras too loose will not likely provide adequate support.

***Please note, a majority of our sports bras are medium support and medium coverage. If you are looking for the highest impact support that we offer; check out the X-Factor, Intensity or Moxie Sports Bra!

SIZE HIP THIGH WAIST
00-0 | XS 34-36" 86-91 cm 19-21" 48-53 cm 24-27" 61-69 cm
2-4 | S 36-38" 91-97 cm 21-23" 53-58 cm 27-30" 69-76 cm
4-6 | M 38-40" 97-102 cm 23-26" 58-66 cm 30-33" 76-84 cm
8-10 | L 40-43" 102-109 cm 26-28" 66-71 cm 33-35" 84-89 cm
10-12 | XL 43-46" 109-117 cm 28-30" 71-76 cm 35-37" 89-94 cm
14-16 | 2XL 47-50" 119-127 cm 31-33" 79-84 cm 37-39" 94-99 cm
18/20 | 1X 51-53" 130-135 cm 34-36" 86-91 cm 40-42" 102-107 cm
20/22 | 2X 54-56" 137-142 cm 37-39" 94-99 cm 42-44" 107-112 cm
24-26 | 3X 57-58" 145-147 cm 40-42" 102-107 cm 44.5-46" 113-117 cm

MEASURING TIPS:

We have determined that your waist measurement will most likely dictate your size. Right on the edge between two sizes? You can utilize your thigh and hip measurements as secondary guidelines to help you find the perfect size.

WAIST MEASUREMENT:

Measure around the smallest part of your torso, keeping the measuring tape as horizontal as possible.

THIGH MEASUREMENT:

Measure around widest area of the thigh.

HIP MEASUREMENT:

Measure around the largest area of your hips, encapsulating the roundest part of your gluteus.

SIZE WAIST HIP THIGH INSEAM (SHORT) INSEAM (REG) INSEAM (TALL)
0 25" 63.5 cm 35-38" 89-97 cm 21" 53 cm 29 32 35
2 26.5" 67.3 cm 36-39" 91-99 cm 22" 56 cm 29 32 35
4 28" 71.1 cm 37-40" 94-102 cm 23" 58 cm 29 32 35
6 29.5" 74.9 cm 38-41" 97-104 cm 24" 61 cm 29 32 35
8 31" 78.7 cm 39-42" 99-107 cm 25" 64 cm 29 32 35
10 32.5" 82.6 cm 40-43" 102-109 cm 26" 66 cm 29 32 35
12 34" 86.4 cm 41-44" 104-112 cm 27" 69 cm 29 32 35
14 35.5" 90.2 cm 42-45" 107-114 cm 28" 71 cm 29 32 35
SIZE SMALL MEDIUM LARGE X-LARGE 2XL 3XL
WAIST SIZE (ELASTIC) 14" (28-30) 35.56 cm 15” (31-33) 38.1 cm 16” (34-35) 40.64 cm 17” (36-37) 43.18 cm 18” (37-39) 45.72 cm 19” (40-32) 48.26 cm
HIP 19" 48.26 cm 20” 50.8 cm 21" 53.34 cm 22" 55.88 cm 23" 58.42 cm 24" 60.96 cm
THIGH 13 1/4” 33.65 cm 14” 35.56 cm 14 3/4” 37.46 cm 15 1/2” 39.37 cm 16 1/4” 41.27 cm 17” 43.18 cm
KNEE 10 3/8” 26.35 cm 10 3/4” 27.30 cm 11 1/8” 28.25 cm 11 1/2” 29.21 cm 11 7/8” 30.16 cm 12 1/4” 31.11 cm
BOTTOM OPENING 7 3/4” 19.68 cm 8" 20.32 cm 8 1/4” 20.95 cm 8 1/2” 21.59 cm 8 3/4” 22.22 cm 9” 22.86 cm
INSEAM 33 33 33 33 33 33 33 33 33 33 33 33
SIZE SMALL MEDIUM LARGE X-LARGE 2XL 3XL
SLEEVE LENGTH 27 1/2” 69.85 cm 28” 71.12 cm 28 1/2” 72.39 cm 29” 73.66 cm 29 1/2” 74.93 cm 30” 76.2 cm
BODY LENGTH (FRONT) 27 1/2” 69.85 cm 28 1/2” 72.39 cm 29 1/2”" 74.93 cm 30 1/2” 77.47 cm 31 1/2” 80.01 cm 32 1/2” 82.55 cm
BODY LENGTH (BACK) 29 1/2” 74.93 cm 30 1/2” 77.47 cm 31 1/2” 80.01 cm 32 1/2” 82.55 cm 33 1/2” 85.09 cm 34 1/2” 87.63 cm
CHEST WIDTH 23” 58.42 cm 24” 60.96 cm 25” 63.5 cm 26 1/2” 67.31 cm 28” 71.12 cm 29 1/2” 74.93 cm
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The Ridgeline Base Layer Top is a next-to-skin base layer containing a super soft Merino wool blend that will quickly dry and wick moisture, even during high levels of exertion in the field. The premium Merino is also anti-microbial and retains its insulation value, even when wet. Heavier version also available for even colder temps (see Ridgeline Top Heavy Base Layer).

Conditions: Cold - Frigid (Paired with Mid-layer and/or Outer Layer)

          - 50% Merino wool, 50% polyester,150GSM
          - Next-to-skin base layer
          - Super soft Merino blend
          - Forward shoulder seams
          - Thumbholes
          - Anti-microbial
          - Thermo-regulating
          - Quick drying

          '-Wash Cool with Like Colors
          -Air Dry

          Model Height: 5'11"
          Model Weight: 200lbs
          Base Layer Top: Large

          Delivery

          Free standard shipping (3-6 days) on orders over $150.

          We also offer express shipping options. See prices at checkout.
          - Next Day
          - 2nd Day
          - Expedited (2-4 Days)

          Returns & Exchanges

          - 45 Day Return Window
          - Free Exchanges
          - Free Returns for Store Credit
          - $12.00 Returns to Original Payment Method
          - See our full Return Policy HERE

          REVIEWS
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          ⌕

          J Joel K.

          verified buyer
          5/2/2025 Awesome product!
          ★★★★★
          This is a very nice merino base layer. Very warm and breathable and moisture wicking. Definitely recommend.
          J

          Joel K.

          verified buyer

          W William M.

          verified buyer
          3/22/2025 WOW this is my new favorite base layer
          ★★★★★
          This thing fits like a glove, is super warm and is my new go to for base layering in the colder months. Not surprised at all with the exceptional quality, everything these guys put out is top notch!
          W

          William M.

          verified buyer

          G Glen M.

          verified buyer
          3/19/2025 Base layer top
          ★★★★★
          Love the fit and quality
          G

          Glen M.

          verified buyer

          D Dustin S.

          verified buyer
          Size Purchased: Large
          Size Normally Worn: Large
          Height: 6' 4"
          Performance: Everyday Wear Hiking Other
          4/2/2023 My go to baselayer
          ★★★★★
          When I bought this I was interested to see how it stacked up to my other merino base layers I have worn over the years. So far, they have moved up the ranks into my #1 pick when I go to put one on. The sizing on these as far as length of sleeve and torso is the best in class.
          D

          Dustin S.

          verified buyer
          Size Purchased: Large
          Size Normally Worn: Large
          Height: 6' 4"
          Performance: Everyday Wear Hiking Other

          C Charles J.

          verified buyer
          Size Purchased: X-Large
          Size Normally Worn: X-Large
          Height: 6' 1"
          Performance: Other Everyday Wear Hiking Weightlifting Going Out
          12/28/2022 Men's Ridgeline Base Layer Top (OD Green)
          ★★★★★
          Great fit, very comfortable, highly recommend for your next base layer upper.
          C

          Charles J.

          verified buyer
          Size Purchased: X-Large
          Size Normally Worn: X-Large
          Height: 6' 1"
          Performance: Other Everyday Wear Hiking Weightlifting Going Out
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          Born Primitive Logo
          Welcome to Born Primitive
          Please select a store location
          LEVEL 1
          - BASE LAYER
          Your next to skin layer. In cold conditions the purpose is two-fold, to draw moisture away from the body to keep you dry while also providing insulative value to ward off hypothermia.
          LEVEL 2
          - MID LAYER
          The purpose of the mid layer is to be worn over base layers but they’re also versatile enough to be worn by themselves and are intended to serve as another layer of heavier thermal protection.
          LEVEL 3
          - OUTER LAYER
          Functionality, durability, packability, and versatility. The level 3 layer provides you with all the options to tackle any climate. This is your first line of defese from the elements.
          LEVEL 4
          - SHELL
          Worn over any combination of levels 1-3, these Shells defy the elements, giving you 100% confidence in their ability to fend off wind, rain, and snow.