The Pet Life Heavy Knitted Dog Sweater is composed of Soft-Heavy Knitted Cotton. Very comfortable and can be worn any time of year. This pet sweater features a Leash-Slit Holder behind the Neck area with Belly Velcro for easy On and Off Access. Available in Multiple Sizes and Colors. 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.