SunnyBay USA-Made 4-lbs Lava Sand Microwave Heating Pad with Organic Cotton Fabric for Cramps and Body Pain, Superior Heat Retention, Washable, Odorless, Weighted, 8x12 Inches.Brand: SunnyBay Color: Navy Blue Features: Drug free Whole Body Relief: Theres no limit to the uses of our lava sand microwavable heating pad. For neck, shoulder, and back pain, period cramps, joint stiffness, or cysts, use warm over the affected areas. Use frozen for sports injuries, swelling, or acute pain. Melt away stress, ease tense muscles, and warm cold feet you get the idea! Dual Hot Cold Action: Thanks to lava sands excellent responsiveness