Anyone that lives in a place where winter isn’t palm trees and boardshorts will appreciate these. Toast Heated Clothing has released a new line of long underwear that stays warm for up to 12 hours. The patented new system uses heat packs to keep the body’s core warm with heat packs that sit in pockets over the neck, lower back and just below the waist. Plus, they’re made with Polartec fabrics, which are known for their warming and wicking properties, to keep you warm and dry. After you run out of the heat packs you can replace them with hand warmers from warmers.com.