This Aviator Nation Bolt thermal is built for warmth and speed! All of our products go through an intense breaking-down process that gives them a vintage feel you'll love because it's broken in from day one of wearing it. - Long Sleeves/Thermals are UNISEX sizing - Hand sewn in our own factory in the heart of Los Angeles - Tri-Blend Fabric: 50% polyester, 38% cotton, 12% rayon - Machine wash cold with like colors. Hang or tumble dry on low