Under Armour's Half-Zip Long-Sleeve Shirt Is Just $31 at REI - Men's Journal

REI Co-op Merino 185 Long-Sleeve Half-Zip Base Layer Top - Men's Tall Sizes

Under Armour Men's Tech 1/2 Zip Long Sleeve Shirt

Under Armour's Half-Zip Long-Sleeve Shirt Is Just $31 at REI - Men's Journal

Hard-charging winter days start out cold, but you always warm up. The men's REI Co-op Midweight Base Layer half-zip top offers the warmth of long

Midweight Base Layer Half-Zip Top - Men's Tall Sizes

Under Armour's Half-Zip Long-Sleeve Shirt Is Just $31 at REI - Men's Journal

Willit Men's Sun Shirts UPF 50+ Protection Hoodie Rash Guard Shirt SPF UV Shirt Long Sleeve Fishing Outdoor Lightweight Black S : Sports & Outdoors

A lightweight, sweat-wicking layer for facing chilly winter days, the men's Mountain Hardwear Ghee half-zip top keeps you comfortable while biking

Ghee Half-Zip Base Layer Top - Traverse - Men's

REI Co-op Sahara Long-Sleeve T-Shirt - Men's

Longer distances and faster runs start with incredible comfort, perfect stretch and a lightweight feel. That's what you get with the men's Under

Streaker Run T-Shirt - Men's