La Sportiva Beyond Shirt Onyx/Chalk

Base Layer
This product is lightweight and highly breathable for perfect body temperature control. The fabric is quick-drying and features an anti-bacterial treatment.

Polartec Delta
Polartec Delta was created so that the fabric's cooling technologies can better utilize the body's natural cooling process. The fabrics in contact with the skin, which aim to absorb sweat and subsequent rapid drying allows moisture to flow, but fails to actually cool the body. Delta performs more effectively because it elevates the contact points, increasing airflow and allowing faster moisture dispersion.