Coupon LABORDAY20 applies to select full-price merchandise only. Offer applies to a single eligible item per order. Online only: offer not available in store. Offer available exclusively to Als.com email subscribers – enroll at checkout. Offer valid through 9/7/2026 at 11:59pm MST. Coupon codes are not stackable: one code per order. Offer is limited on on-hand items only. Offer is not transferable and is not redeemable for cash. Not valid on special orders, gift cards, tax, shipping, rentals, previous purchases or bundle discounts. Brand and category exclusions apply. Offer subject to change without notice. See als.com/promotions for details. |
The Smartwool Classic Thermal Merino Base Layer Bottom - Men's is a warm base layer for winter activity. Hike, ski, camp, the list goes on, and when it's cold, this 100% Merino wool layer is ready for action. The soft fabric is the warmest-weight available in the line, for toasty comfort in the outdoors. Remain focused on the adventure, while the fabric manages sweat, resists odors, and regulates temperature.
Size Guide
| 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 |
Chest — Measure under the arms, around fullest part of chest and back circumference.
Waist — Measure around natural waistline, keeping tape a bit loose.
Hip — Measure around the fullest part of hip circumference, parallel to the floor.
Arm Length — With elbow bent slightly, measure frocm center back of neck, across top of shoulder, to elbow and down to wrist bone.
Inseam — Measure along inside leg from crotch to ankle bone. Or measure a good fitting base layer pant from crotch seam to bottom along seam.
