Heavyweight Crewneck Sweatshirts , Heavyweight sweatshirts Contact for Huge selection of Style # Heavyweight Crewneck Sweatshirts. Very heavyweight reverse-weave crew-neck sweatshirt from 100% cotton twill fabric 95% cotton / 5% poly. 100% cotton sweatshirt face (outer shell). The 5% poly is embedded in the inside fleece backing of the garment. We've been doing it this way for almost 40 years. Place your order: 800-341-4600.All Rights Reserved