Smartwool Intraknit Thermal Merino Base Layer 1/4 Zip Men's Lights & Electronics Natrapel is safe to apply

Natrapel is safe to apply to your clothing and gear

Delta Coring removes over 40% of the foam to reduce weight and bulk without compromising durability

* Outfitting — updates on planning your pack weight

Dynafit® certified tech inserts

While we're on the trail

Smartwool Intraknit Thermal Merino Base Layer 1/4 Zip Men's Lights & Electronics Natrapel is safe to applyNew to our innovative Intraknit line is the Men's Intraknit Thermal Merino Base Layer 1 4 Zip. This Smartwool base layer is 3D mapped for a near custom fit and freedom of movement. Its engineered construction helps enhance your performance with a lighter weight and cleaner finish. If you're looking for base layer clothing for cold weather, this one uses Merino Sport yarn that combines the power and benefits of Merino wool with the durability and fast