EASE OF USE: Wide, full-length opening allows for easy insertion and removal of gel packs. Easily adjust the fit with a convenient hook-and-loop fastener at the wrist. SIZING: The Small/Medium and Large/XL mittens are similarly sized to standard winter mittens or gloves. If ever in doubt, choose the larger size. MORE MOBILITY: Unlike competing products with zero mobility, each mitt includes an articulated thumb and segmented gel pack gussets to help fingers bend more easily. INCLUDES: Two insulated mittens with a soft Lycra lining and Four (4) inner gel cold packs to ensure long cold therapy treatments. USES: Within seconds, chills fingers and entire hand to help relieve pain, swelling and chronic joint conditions like arthritis. Frequently used to relieve chemotherapy side effects.