This joggers come with a sherpa lining on the inside to keep you warm and comfortable during winter. The fabric has a high fibre strength and is soft to touch. The sherpa fabric is not only resistant to alkali, it is also mold and insect resistant. These are the perfect joggers to stay in or go out during winter. Looks like sheep fur, acts like sheep fur but it is not sheep fur, it is Sherpa. Made to look like and feel like animal fur but without harming animals and is cruelty free.