Made from 100% cotton muslin, our comfy cozy crib sheets are made to keep your little one the perfect temperature and look beautiful in your nursery. The loose weave of the muslin allows for air flow and prevents overheating. Sheets feature elastic corners for easy application and easy removal. Featuring some of our favorite National Parks including: Yellowstone, Yosemite, Grand Teton, Rocky Mountain, Volcanoes, Joshua Tree, Redwood, Arches, Zion, Glacier, and Grand Canyon. 100% cotton muslin Loose weave that breathes and keeps your little one the perfect temperature Machine Washable A fun pattern you and your kids will love 52" x 28" x 6" - fits standard crib/toddler bed mattress