It is the nature of polyurethane foam to discolor when exposed to light and oxygen. The polyurethane foam used in this product may have a slight odor when first removed from the packaging. The odor does not affect the performance of this product. Remove this product from packaging several days prior to use to eliminate odors from the manufacturing processPlace this cushion against your lower back as you sit. Move the cushion up or down as needed. Use strap to secure the cushion in placePolyurethane foam -Cover -65% polyester/ 35% cotton -14 x 13 x 5.