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.Sizing guide: from back of neck to tail area ("in" inches) 8" : extra small 10-12": small 14-16": medium 18-20": large 22-24": extra large