From the product description, check product page for current description, price and availability:

• Better than Ice – 2 lb. mid-size gel pack makes items in cooler slushy cold Only Cooler Shock is 18° F so packs last 24-48 hrs.
• Reusable – Click the blue “CoolerShock” at top of this page to see all versions – Coldest pack available
• Accelerates cooling with burst cooling at 18 degrees – 8 mil thick flexible 3-layer purpose built pack rapidly transfers energy – Fully reusable
• Ships with CS dry mix, you hydrate and save. 2lbs gelled – simple instructions or see our website video Made in USA with Non-toxic ingredients, child safe. Lasts up to 48 hours depending on use