Smartwool Men's Active Boxer Brief

If your undies aren't comfy, you won't be either. That's why we've designed the Men's Active Boxer Brief with features like a double front panel for extra support and seams that help prevent chafing. Plus, of course, the entire brief lets you enjoy the benefits of ZQ-certified Merino wool: moisture management, temperature regulation, and odor control. For a day filled with first-layer comfort—no matter what your adventure holds—pull on a pair of these briefs and get rollin'.

Size	U.S. Men's Shoe Size	U.S. Women's Shoe Size	Euro Shoe Size	UK Shoe Size
S	3-5.5	4-6.5	34-37	2-4.5
M	6-8.5	7-9.5	38-41	5-7.5
L	9-11.5	10-12.5	42-45	8-10.5
XL	12-14.5	N/A	46-49	11-13.5
XXL	15-17.5	N/A	50-53	14-16.5

Size	U.S. Shoe Size	Euro Shoe Size	UK Shoe Size
XS	6-8.5	22-25	5-7.5
S	9-11.5	26-28	8-10.5
M	12-2.5	29-32	11-13.5
L	3-6	33-36	1-4.5

Size	Chest	Waist	Hip	Arm Length	Inseam
S	36"-38" 91.5-96.5cm	29"-31" 73.5-78.5cm	36"-38" 89-96.5cm	31"-32" 68.5-81.5cm	30"-31" 73.5-78.5cm
M	39"-41" 99-104cm	32"-34" 81.5-86.5cm	39"-41" 99-104cm	32"-33" 81.5-84cm	31"-32" 78.5-81.5cm
L	42"-44" 106.5-112cm	35"-37" 89-94cm	42"-44" 106.5-112cm	33"-34" 84-86.5cm	32"-33" 81.5-84cm
XL	45"-48" 114.5-122cm	38"-40" 96.5-101.5cm	45"-48" 114.5-122cm	34"-35" 86.5-89cm	33"-34" 84-86.5cm
XXL	49"-51" 124.5-129.5cm	41"-44" 104-112cm	49"-51" 124.5-129.5cm	35"-36" 89-91.5cm	34"-35" 86.5-89cm
How to Measure	Measure under the arms, around fullest part of chest and back circumference.	Measure around natural waistline, keeping tape a bit loose.	Measure around the fullest part of hip circumference, parallel to the floor.	With elbow bent slightly, measure from center back of neck, across top of shoulder, to elbow and down to wrist bone.	Measure along inside leg from crotch to ankle bone. Or measure of good fitting base layer pant from crotch seam to bottom along seam.

Size	Comparable Bra Size
XS	30A, 30B, 30C, 32A, 32B
S	32C, 32D, 34A, 34B
M	34C, 34D, 36A, 36B
L	36C, 36D, 38A, 38B
XL	38D, 38C, 40A, 40B, 40C, 40D

Size	Age	Chest	Waist	Height	Weight
XXS	2-3	22.5"-23.5" 57-60cm	20"-21.5" 50-54.5cm	35"-41" 80-104cm	31-41 lbs
XS	4-5	24"-25" 61-63.5cm	22"-22.5" 56-57cm	42"-48" 106.5-122cm	42-49 lbs
S	6-8	25.5"-26.5" 64-67.5cm	23"-24" 58.5-61cm	48"-54" 122-137cm	49-59 lbs
M	9-10	27"-28" 68.5-71cm	24.5"-25" 62-63.5cm	54"-57" 137-145cm	59-75 lbs
L	11-12	28.5"-30" 72.5-76cm	25.5"-26" 65-66cm	57"-60" 145-152.5cm	75-89 lbs
XL	13-14	30.5"-32" 77.5-81cm	26.5"-28" 67.5-71cm	60"-62" 152.5-157.5cm	89-100 lbs

Size	Chest	Waist	Hip	Inseam	Arm Length
XXS M's XXS / W's XS	32-33in 81.5-84cm	24-25in 61-63.5cm	31-32in 78.5-81.5cm	30-31in 76-78.5cm	30-31in 76-78.5
XS M's XS / W's S	33-35in 84-89cm	26-28in 66-71cm	33-35in 84-89cm	31-32in 78.5-81.5cm	31-32in 78.5-81.5cm
S M's S / W's M	36-38in 91.5-96.5cm	29-31in 73.5-78.5cm	36-38in 91.5-96.5cm	31-32in 78.5-81.5cm	31-32in 78.5-81.5cm
M M's M = W's L	39-41in 99-104cm	32-34in 81.5-86.5cm	39-41in 99-104cm	31-32in 78.5-81.5cm	32-33in 81.5-84cm
L M's L = W's XL	42-44in 106.5-112cm	35-37in 89-94cm	42-44in 106.5-112cm	32-33in 81.5-84cm	33-34in 84-86.5cm
XL M's XL = W's XXL	45-48in 114.5-122cm	38-40in 96.5-101.5cm	45-48in 114.5-122cm	32-33in 81.5-84cm	34-35in 86.5-89
XXL M's XXL / W's XXXL	49-51in 124.5-129.5cm	41-44in 104-112cm	49-51in 124.5-129.5cm	33-34in 84-86.5cm	35-36in 89-91.5cm

Size	Head Circumference
Adult - One Size Fits Most (1SFM)	21.5"-23.5" 55-60 cm
Kids L/XL	21.5"-23" 54.5-56 cm
Kids S/M	20.5"-21" 52-53.5 cm
Baby 12-24 Months	18"-19.5" 48-52 cm
Baby 6-12 Months	17"-18" 43-47 cm

Size	Arm Length	Bicep	Wrist
S/M	27-32in 68.5-81.5cm	9.5-12.5in 24-32cm	5.5-7in 14-18cm
L/XL	32-36in 81.5-91.5cm	12.5-16in 32-40.5cm	7-8.5in 18-21.5cm

Size	Hand Width	Hand Length
S	5" - 5.5"	5.5"
M	5.5" - 6"	6"
L	6 - 6.5"	6"