Aclima Hotwool® Polo by Crye Precision is a more robust base layer top for activities in freezing temperatures. Its thicker Merino wool composition makes for a durable and warm base layer due to its wool/polyester/polyamide blend. HotWool’s terry interior creates insulative air pockets that trap the wearer’s body heat. This trait has made Aclima® HotWool a go-to base layer for Special Operations Forces in cold climates. Layer the HotWool base layers over the WoolNet layers for extreme cold environments when maximum insulation is required. The HotWool layers integrate with Crye Precision G3/G4 uniforms. They can be worn underneath in cold environments to add scalable layers of insulation.