The Dr. Handy's Dandy I-Beam Pillow was designed to be more than just your average knee pillow. This all-purpose pillow can be used between your knees, thighs, ankles, behind the head and neck, under your arms or legs, as a travel pillow, and much more! Designed from a high density polyurethane foam, this pillow is built to last and hold up during long periods of use. Using our patented ridge vent system (RVS), users will notice air flow through out the use of this product makin it superior to other products on the market. Cool air channels throughout both sides of the pillow while warm air channels out. While most bedding components are sure to have some heat build up, the I-Beam Pillow will not add to that!