





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. |
Spring skiing or summer camping? The year-round Men's Classic All-Season Merino Base Layer Long Sleeve is ready for either. With the Core Spun technology, Smartwool has wrapped lightweight Merino around a nylon core for added durability, while still keeping the comfort of ultra-soft, responsibly sourced Merino next to the skin. They added smooth flatlock seams to help minimize chafing and offset shoulder and side seams to lie smoothly beneath pack straps. No matter the season or the activity, this base layer is made for it.
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.