Smartwool 250 Baselayer Zip-T - Men's SealLine allowing for greater customization

allowing for greater customization

Mesh zones for added breathability

and emergency use

The compact size

Food-safe containers with interchangeable caps

Smartwool 250 Baselayer Zip-T - Men's SealLine allowing for greater customizationDescription Features & Specs Size Chart Smartwool has updated the fit of their Men's Merino 250 Base Layer 1 4 Zip to improve functionality while also enhancing aesthetics. As one of their heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as help keep you comfortable and temperature regulated as you