Megi Pet Dog Sporty Shoes Canvas Dog Boots Nonslip Dog Booties Sneaker for Chihuahua Yorkie Small Doggies Pink S Filled with extra thick 100-percent poly fill for maximum comfort Self-warming material radiates heat back to your pet With a washable and detachable cushion at the bottom,no need of electricity to keep warm It converts from a house to a bed in just one simple fold. It is made of very lightweight material and can easily be carried around when traveling.