Ideal for cold treatment on specific sites. These anatomically-shaped, vinyl cold packs remain flexible and conformable down to 0 F degrees (-18 C degrees). Place packs in a freezer to cool. Maintains cold for up to 30 minutes. Wrap pack in cloth. Do not apply directly to skin. Not indicated for people with insensitive skin or poor blood circulation. Thick, high-quality gel ensures longer lasting cold. Standard 11" x 14" (28 x 36cm), Half Size 7" x 11" (18 x 28cm), Quarter Size 5-1/2" x 7-1/2" (14 x 19cm), Over-Size 11" x 21" (28 x 53cm), Neck Contour 23" long (58cm long), All Purpose 4" x 11" (10 x 28cm) (28 x 36cm), Half Size 7" x 11" (18 x 28cm), Quarter Size 5-1/2" x 7-1/2" (14 x 19cm), Over-Size 11" x 21" (28 x 53cm), Neck Contour 23" long (58cm long), All Purpose 4" x 11" (10 x 28cm)