4 SIZES: Standard?? Oversize?? Half size?? & Neck Contour</br>COLDER FOR LONGER: Proprietary gel stays colder for Longer than competing products that use inferior bentonite formulations.</br>MORE FLEXIBLE: The Most Flexible Cold Pack available due to a professional-grade gel interior that remains pliable when frozen?? which provides better contact by conforming to any part of the body.</br>HEALTHCARE PROFESSIONAL'S CHOICE: Used by thousands of Physical Therapists and other healthcare professionals to relieve acute & chronic pain?? muscle pain?? arthritis?? inflammation?? swelling??