Smartwool Men's Classic Thermal Merino Base Layer Bottom

Name: Smartwool Men's Classic Thermal Merino Base Layer Bottom
Brand: smartwool
SKU: B08BCV8GV5-variation
Price: 37.5 USD
Availability: InStock

$37.50

~~$125~~ $37.50

Save 70% Sold out

SELLING FAST! 42 People are looking at this!

Product variants

Quantity

Subtotal: $37.50

Currently 1000 items are in stock!

Order in & get it by | 60-day returns on all orders

About_this_item

100% Wool
Made in the USA
COLD WEATHER BASE LAYER. Keep your ski or hiking boots free of bulk and friction with our 3/4 Bottom. Merino wool provides ultimate comfort, while a newly redesigned base layer pants fit helps reduce sag and excess fabric—perfect for layering.
SLIM FIT. Designed to meet the demands of outdoor adventuring, these slim fit bottoms show off a slimming silhouette while offering unrestricted movement through the legs. Inseam: 21.5"
CLASSIC THERMAL MERINO. Ideal for cold-weather activities where warmth and breathability are crucial, this midweight fabric used a Merino wool construction that helps move moisture away from skin to keep you warm and dry.
FUNCTIONAL FEATURES. Go far, feel good with thoughtful tech to keep you trekking comfortably — interlock knitting enhances breathability, thermoregulation and moisture-wicking while flatlock seams minimize chafing for greater comfort.
GO FAR. FEEL GOOD. From wool socks to base layers for men, women and kids, we aim to provide the highest quality apparel for your outdoor adventures with a commitment to environmental sustainability, racial equity and inclusivity.

› See more product details

View full details

size

Outdoor Sock & Apparel Size Guide

Use the charts below to find the right fit for socks, tops, bottoms, headwear and gloves. Measurements are shown in both inches and centimetres. Tip: if you fall between two sizes, most merino wool apparel is designed to layer — choose the larger size for a relaxed fit and the smaller size for a performance fit.

Unisex Socks Men's Apparel Women's Apparel Kids' Socks Headwear & Gloves

1. Sock Size (Unisex)

Sizing is based on U.S. shoe size and EU equivalent.

Size	U.S. Men's	U.S. Women's	EU	UK
S	3 – 5.5	4 – 6.5	34 – 38	2 – 4.5
M	6 – 8.5	7 – 9.5	39 – 42	5.5 – 8
L	9 – 11.5	10 – 12.5	43 – 46	9 – 11.5
XL	12 – 14.5	—	47 – 50	12.5 – 14

Sock sizing is based on foot length. If you wear a half size, size up for a more relaxed fit or down for a snug performance fit.

2. Men's Tops & Base Layers

Body measurements. Measure over light clothing.

Size	Chest (in)	Chest (cm)	Waist (in)	Waist (cm)	Sleeve (in)	Sleeve (cm)	Hip (in)	Hip (cm)
XS	33 – 35	84 – 89	27 – 29	69 – 74	31 – 32	79 – 81	33 – 35	84 – 89
S	36 – 38	91 – 97	29 – 31	74 – 79	32 – 33	81 – 84	36 – 38	91 – 97
M	39 – 41	99 – 104	32 – 34	81 – 86	33 – 34	84 – 86	39 – 41	99 – 104
L	42 – 44	107 – 112	36 – 38	91 – 97	34 – 35	86 – 89	42 – 44	107 – 112
XL	46 – 48	117 – 122	40 – 42	102 – 107	35 – 36	89 – 91	46 – 48	117 – 122
XXL	50 – 52	127 – 132	44 – 46	112 – 117	36 – 37	91 – 94	50 – 52	127 – 132

Chest: measure under the arms, across the fullest part. Sleeve: from the centre back of the neck, over the shoulder, to the wrist.

3. Women's Tops & Base Layers

Body measurements over light clothing.

Size	Numeric	Bust (in)	Bust (cm)	Waist (in)	Waist (cm)	Hip (in)	Hip (cm)	Sleeve (in)	Sleeve (cm)
XS	0–2	30 – 32	76 – 81	24 – 26	61 – 66	33 – 35	84 – 89	29 – 30	74 – 76
S	4–6	32 – 34	81 – 86	26 – 28	66 – 71	35 – 37	89 – 94	30 – 31	76 – 79
M	8–10	34 – 36	86 – 91	28 – 30	71 – 76	37 – 39	94 – 99	31 – 32	79 – 81
L	12–14	37 – 39	94 – 99	31 – 33	79 – 84	40 – 42	102 – 107	32 – 33	81 – 84
XL	16	41 – 43	104 – 109	34 – 36	86 – 91	44 – 46	112 – 117	33 – 34	84 – 86

Bust: measure at the fullest part, keeping the tape level. Waist: measure at the narrowest point, just above the navel.

4. Men's Bottoms

Pants, leggings, tights & shorts.

Size	Waist (in)	Waist (cm)	Hip (in)	Hip (cm)	Inseam – Short (in)	Inseam – Regular (in)	Inseam – Long (in)
XS	27 – 29	69 – 74	33 – 35	84 – 89	29	31	33
S	29 – 31	74 – 79	35 – 37	89 – 94	29	31	33
M	32 – 34	81 – 86	38 – 40	97 – 102	30	32	34
L	36 – 38	91 – 97	42 – 44	107 – 112	30	32	34
XL	40 – 42	102 – 107	46 – 48	117 – 122	30	32	34
XXL	44 – 46	112 – 117	50 – 52	127 – 132	30	32	34

Inseam is the inside-leg length. For bottoms sold as Short / Regular / Long, pick the inseam length that matches your height.

5. Women's Bottoms

Pants, tights, leggings & shorts.

Size	Numeric	Waist (in)	Waist (cm)	Hip (in)	Hip (cm)	Inseam – Short (in)	Inseam – Regular (in)	Inseam – Long (in)
XS	0 – 2	24 – 26	61 – 66	33 – 35	84 – 89	28	30	32
S	4 – 6	26 – 28	66 – 71	35 – 37	89 – 94	28	30	32
M	8 – 10	28 – 30	71 – 76	37 – 39	94 – 99	28	30	32
L	12 – 14	31 – 33	79 – 84	40 – 42	102 – 107	28	30	32
XL	16	34 – 36	86 – 91	44 – 46	112 – 117	28	30	32

6. Hats & Headwear

Beanies, neck gaiters & caps.

Size	Head Circumference (in)	Head Circumference (cm)
OSFM	21 – 23.5	54 – 60
S / M	21 – 22.5	54 – 57
L / XL	22.5 – 24	57 – 61

Measure around the forehead, just above the ears and across the widest part at the back of the head.

7. Gloves & Mittens

Unisex sizing. Measure around the palm.

Size	Palm Circumference (in)	Palm Circumference (cm)	Hand Length (in)	Hand Length (cm)
XS	6 – 6.5	15 – 16	6.5 – 7	16.5 – 18
S	7 – 7.5	18 – 19	7 – 7.5	18 – 19
M	8 – 8.5	20 – 21	7.5 – 8	19 – 20
L	9 – 9.5	23 – 24	8 – 8.5	20 – 21.5
XL	10 – 10.5	25 – 27	8.5 – 9	21.5 – 23

Palm circumference: measure around the knuckles of a relaxed hand, excluding the thumb. Hand length: from the base of the palm to the tip of the middle finger.

8. Kids' Socks

Sized by age range and shoe size.

Size	Age Range	U.S. Kids' Shoe	EU Shoe	UK Shoe
S	4 – 7 yrs	11 – 13	28 – 32	10 – 12
M	7 – 10 yrs	13 – 3Y	32 – 34	12 – 2Y
L	10 – 14 yrs	3Y – 6Y	35 – 38	2Y – 5Y

Toddler (under 4 yrs) styles are sized as XS — please refer to the specific product page for that chart.

How to Measure

Three quick steps for an accurate fit.

1. Use a Soft Tape

Use a flexible fabric tape measure. Keep it level and snug against the body, without pulling tight.

2. Measure Over Light Layers

For body measurements, wear light clothing. Measure chest or bust at the fullest part, waist at the natural waistline.

3. Pick by Fit Preference

Between two sizes? Choose the larger size for a relaxed fit and the smaller size for a close-to-skin, performance fit.

Smartwool Men's Classic Thermal Merino Base...

XX-Large /

Charcoal Heather

$37.50

~~$125~~ $37.50

Smartwool Men's Classic Thermal Merino Base...

XX-Large /

Charcoal Heather

$37.50

~~$125~~ $37.50

Your cart is empty

Your Cart – 0

Estimated total

$0.00 USD

You might like...

Smartwool Men's Classic Thermal Merino Base Layer Bottom

Smartwool Men's Classic Thermal Merino Base Layer Bottom

About_this_item