100% Memory Foam 4 Position Pillow Designed For: Under the head for proper airway alignment. Can be used with your favorite pillow; Under the neck for neck support; Under the knees to relieve back pain & for the back for lumbar support. Also superb for travel as it folds to 25% of its size! Zip off plush sherpa cover for easy care. wash & dry-gentle. PLEASE NOTE: WE CANNOT ACCEPT RETURNS FOR THIS ITEM DUE TO THE NATURE OF THE PRODUCT.