rester's choice cold therapy reusable gel pack – extra large 13x21.5” ice pack for back, knee, legs, and shoulders – cold ice gel pack reduces pain and swelling from injury and surgery rester's choice say goodbye to filling up baggies with ice every time you have an ache! it’s a pain — and you already have enough of that! rester's choice ice packs for injuries make your life easier and reduce discomfort directly and easily. every pack is reusable, flexible, and created for you to place on your back, shoulders, shins, and thighs to bring you fast pain relief. rest and recover with rester's choice.