The Touchdog Onesie Lightweight full bodied T-shirt Jumpsuit is composed of soft high thread count polyester, cotton and Lycra. These Pajamas cover the legs and arms for a more expandable fit and comfortable sleep, fabric is also breathable. Features accented print detail along the back with a leash slit along the neck area. Machine washable. Available in Multiple Colors and Sizes. NNSizing Guide: From Back of Neck to Tail area ("In" Inches) N8" : EXTRA SMALL N10-12": SMALL N14-16": MEDIUM N18-20": LARGE N22-24": EXTRA LARGE Touchdog Onesie Lightweight Breathable Red Pet Dog/Cat Pajamas - Unisex, Medium Size, Polyester Material | PJ1RDLG