Men's Turtleneck Sweaters Simons Canada Cotton Button Mock Neck Pullover in Sweatshirts & Hoodies Vince Winter Fleece Warm Mock Neck Long Sleeve Shirt Turtleneck Slim Fit Tee Mens Mock Turtleneck Jumper Made Of 100% Cotton Knit: Crafted in a. Crafted from Japanese fabric with a velvety soft, napped surface comprising three layers which allow this top to generate heat in less than 20 minutes of wearing. While able to achieve outstanding levels of insulation, it is still incredibly lightweight and stretches, making it comfortable to wear by itself or as a base layer.