Abstract: A horse blanket (1) has an overlay (2) of traditional shape for a horse blanket and a set of protuberances (3) which stand proud of the lower surface of the overlay (2). The protuberances (3) are arranged substantially according to a rectangular grid that overlies only a portion of the underside of the overlay (2). Each protuberance (3) is approximately triangular in cross-section and has a base portion (11) that is fixed in any suitable manner to the overlay (2). The region (12) that would otherwise be the apex of the triangle is truncated and rounded. The protuberances (3) are made from gas-filled plastic so that each protuberance (3) is formed as a longitudinally extending, hollow body.