Minus33 Chocorua Midweight Wool Crew vs Smartwool Classic Thermal Merino 1/4 Zip

Both are 100% merino midweight base layers, so the real split is the zip and the fit. The Minus33 Chocorua is a plain crew in a 245 g/m² interlock knit with 18.5 micron fibers, machine wash and dry, and a 4.8 rating across 332 owners. The Smartwool Classic Thermal 1/4 Zip adds a quarter zip for venting and flatlock seams to cut chafing, which suits stop-and-go cold weather activity. Pick the Minus33 for a durable everyday crew; pick the Smartwool if you run hot and want to dump heat without stripping a layer.

• Choose the Minus33 Chocorua if you want a simple, warm crew you can machine wash and dry and wear under anything.
• Choose the Smartwool Classic Thermal 1/4 Zip if you want to vent heat mid-activity and prefer flatlock seams against your skin.