The Black Diamond Lightweight Gridtech Glove is a grid fleece liner designed to be worn underneath a shell glove. They come equipped with touchscreen compatible digits so you don't have to take your liners off to access your smartphone. These lightweight liners are great for hot skin tracks on the up and extra insulation underneath a shell glove/mitten on the down. If you're a nerd [like me], these gloves are made with 90 g Polartec® Power Grid fabric.