Description of Marmot Lost River L/S Half Zip - Women's Fast-drying, stretchy nylon and a practical half-zip make the Lost River Long Sleeve an ideal top for long days out under a wide range of temperatures. Features: Main Material: 92% Cotton/8% Elastane Half-zip Neck Longer Length for Layering M-Dot Logo Heat Transfer Nylon Supplex Knit Secure Stash Pocket