Offering innovative design, Casper's best selling Original Pillow, provides adaptive comfort, relative to all sleep positions of a sleeper. Their unique pillow-in-pillow design, responds to body movements and helps the sleeper stay asleep. An inner pillow, filled with shorter fibers, provides adaptive support. Combined with the fluffy, adaptive surface, of the outer pillow's clump-resistant fibers, which yields added softness and results in a perfect balance between the two, promoting both. Coolness, inherent of either side, of the pillow, is due to the breathable, percale weave of the 100% cotton cover. This allows air flow, keeping sleepers cool all night. Thus, front to back or side to side, Casper Original Pillow, is applicable to all sleeping positions, offering just right squish and just right support. So pile on the comfort! Please note, no returns once item is opened.