BOOSTERThe insulated sheet that transforms into a pillow on the go. Add 10F of warmth to your system Use on its own comfortably to ~55F 13C. Wing grabs in the corners let you wrap it around you and yours Loops on the sides align perfectly with the Hoverquilt (Duo or Solo). Integrated zipper pocket to stash phone, keys, headlamp, & transforms into comfy pillow This is pure comfort on the go. With a touch of insulation between softweave fabrics, it packs down