mimiTENS booties are lined with 3M's Thinsulate (100 gram) and a 70/30 bamboo/organic cotton rayon fleece. The soles are ultra suede so they are not slippery. Wash them in cold water and air dry.
Matching mittens can be found here.
OUTSIDE: 100% water-repellent nylon
LINING: 3M Thinsulate + 70/30 bamboo/organic cotton rayon fleece
SOLE: 100 % polyester
CUFF: 90% cotton + 10% lycra