There is a new opinion that if you train with extra weight than you’ll perform better when it’s taken off. This is just part of the concept behind the Titin Weighted Compression Shirt, which also allows athletes to pack the base layer with gel inserts. These can be heated or cooled and either way add eight pounds to the torso. The heat can obviously help relax sore muscles while cold packs could be used to stay cool on hot day. In addition it could be used post-workout for an icing routine.