The Men&';s Terramar Thermolator Half Zip is a great base layer when the weather turns cold but you need to be out working or playing. Designed using Terramar&';s Climasense fabric (86% Recycled Polyester, 14% Spandex Jersey). A 2.0 rated base layer the most versatile top at a great price. Featuring flat seam construction and a reflective logo.Features: UPF Rated 50+4 way Stretch & Ultra-soft brushed FaceTermoregulation Technology