Smartwool
Classic Thermal Merino Base Layer 1/4 Zip
Manufacturer list price (MSRP)
$128.00
Retailer prices change, so we show the manufacturer list price and link out for you to check the current price.
Overview
Smartwool's flagship cold-weather base layer: 250 g/m2 of 100% interlock-knit merino with a quarter zip for venting. It is the reference point most heavyweight merino baselayers get measured against, worn as often as a standalone winter midlayer as under a shell.
Specs
- Brand
- Smartwool
- Weight
- 411 g · 14.5 oz
- Type
- Heavyweight base layer, 1/4-zip collar
- Construction
- Flatlock seams, shoulder panels for pack-strap comfort
- Item Weight
- 11.68 ounces
- Material
- 100% merino wool, 250 g/m2 interlock knit
- Material Type
- Wool
- Seasons
- Fall
Weight vs. category
This product14.5 oz
Category average10.5 oz
38% heavier than the category average.
Our verdict
Smartwool Classic Thermal Merino Base Layer 1/4 Zip is listed in the Base Layers category. Its listed weight is 38% heavier than the category average. The manufacturer list price is $128.
Similar — lighter or cheaper
Related reading
Start here
The Complete Beginner Backpacking Gear List
Everything you actually need for your first overnight — and what you can skip.
Buying guide
Best Lightweight Backpacking Tents (2026)
Eight shelters ranked by weight, livability, and price — with honest reasons to skip each one.
How-to
How to Get Your Base Weight Under 10 lbs
A practical, no-gimmicks path to a lighter pack.
Manufacturer list price (MSRP)
$128.00