The Hot & Cold Therapy Sleeves help protect the skin from freeze or heat burns. The therapy sleeves are available in 2 different size to suit most of instant cold packs and hot and cold packs. The small Hot & Cold Therapy Sleeve is suitable for use with the compact and standard HypaCool Instant Ice Packs and small and medium HypaGel Hot/Cold Therapy Packs. The large one is suitable for use with the large HypaGel Hot/Cold Therapy Pack.