So you have really nice jackets and outerwear that look great but are just not warm enough? Try out our battery heated base layers, shirts, pants, and underwear. These electric base layers come in both men's, women's, and unisex sizes and will keep you toasty and warm even on the coldest days. No need to bulk up with layer upon layer when it gets really cold, these men's and women's base layers do the trick without bulk.