The ventilated knit material makes this sling not only comfortable for you and your dog in warm weather but works year round as a doggy tote bag. With the ability to fold up into the palm of your hand and weighing only 3 oz., this versatile dog sling carrier can accompany you and your dog anywhere you want to go! Sizing is based on human fit not dog size. Measure yourself from the top of your collar bone, across the chest to the opposite hip bone. Medium 23" across (petite, smaller adult frame). Large 25" across (tall, larger adult frame). Sizing: Medium 23" across (petite, smaller adult frame) Large 25" across (tall, larger adult frame) This product is resistant to stains and discoloration and is machine washable. Since our brand establishment in 2003, our products have always been 100% made in our Southern California warehouse. By locally handcrafting each piece to order, we can give more attention to detail and closely inspect each item As ingredient branding partners with Swarovski, we receive training and instruction to crystalize our products to the finest degree.