Men's Merino Boxer
Smartwool Size Chart
We want you to be 100% satisfied and comfortable with your Smartwool purchase. Our sock, clothing, and accessories size charts are specifically designed to help you find the best fit for men's, women's, and kids' Smartwool products.
| 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 |
Frequently Asked Questions on Sock Sizing
Do Smartwool socks run big, small, or true to size?
Smartwool socks run true to size, based on your total foot length (and calf circumference, for compression socks). Refer to the sock size charts above to identify which size is right for you.
How do I know what size is right for me?
With proper foot length (and calf circumference, when applicable), you can reference the above Smartwool socks size chart to ensure the right size. If you have specific questions about size and fit, feel free to contact us.
Will Smartwool socks shrink or stretch?
Not with proper care. Smartwool's high-quality wool sock construction methods help your socks retain their shape and fit.
Does Smartwool provide sock repairs?
We don't have a repair service, but if you're not completely satisfied with your socks, you have two years to return them. See the details of the Smartwool satisfaction guarantee to see if we can help you.
What if a pair of socks I order doesn't fit?
We’ve got your back--er, feet! Smartwool offers free returns within 30 days of purchase, so you can easily return any socks that don’t fit. Visit our Free Return Policy for more details.
| 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 |
Frequently Asked Questions on Clothing Sizing
Does Smartwool clothing run true to size?
Yes. Refer to the clothing size charts above to identify which size is right for you based on your body measurements.
How do I know what size is right for me?
Taking proper measurements and referencing the applicable Smartwool size chart will enable you to identify the best fit. If you have specific questions about size and fit, feel free to contact us.
Does Smartwool carry petite and big/tall sizes?
Smartwool offers standard sizes for men (S-XXL), women (XS-XL), and kids (XS-XL). We do not officially offer petite or big/tall sizes. Refer to the clothing size charts above to identify which size is right for you.
Will Smartwool clothing shrink or stretch?
With the proper care, detailed on each specific product page, your Smartwool clothes should retain their original fit throughout their normal lifecycle. Visit our care page for details on how to care for your wool socks and clothing.
Does Smartwool provide alterations?
We don't provide alterations. We are confident our standard sizes will provide a satisfactory fit. If you have specific questions about size and fit, feel free to contact us.
What if the size I order does not fit--or I got the wrong color?
No worries! Our 100% Satisfaction Guarantee ensures you'll receive an exchange or refund. Check out our Free Return Policy for details.
| 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" |
| Size | Hand Size |
| XS | 6"-6.5" 15-16.5 cm |
| S | 7"-7.5" 18-19 cm |
| M | 8"-8.5" 20-21.5 cm |
| L | 9"-9.5" 23-24 cm |
| XL | 10"-10.5" 25-27 cm |
Frequently Asked Questions on Accessories Sizing
Do Smartwool hats and gloves run big, small, or true to size?
True to size. Apply proper measurement of your head circumference and hand size to the applicable size chart above to choose the best size.
How do I know what size is right for me?
Smartwool hats and gloves come in standard sizes, helping to minimize size issues. With the proper measurements and applicable Smartwool size chart, you can be confident in your size selection. But if you're still wondering, feel free to contact us.
Will Smartwool hats and gloves shrink or stretch?
Because Smartwool products are designed to retain their fit and shape, proper care and maintenance will help avoid shrinking or stretching. You can see details about how to care for your Smartwool products on our wool care page.
Does Smartwool provide alterations?
No. And with our standard-sized wool hats and gloves, the need for alterations is rare.
What if I don't like the size, color, or style?
We understand. That's why we offer a Free Return Policy and 100% Satisfaction Guarantee--to ensure you get the wool hat or gloves you want and love.
Find the size that fits you best based on people just like you.
