Soothing therapy where you need it the most! The patented EndoFEMM® Pad is designed to ease pelvic pain while providing hot or cold therapy. Features: ~ Reverse to cover lower back and tail bone. ~ Fits waists 26 inches to 40 inches. ~ Approximate weight, 2 pounds, 20 ounces. ~ Measures approximately, 15"W x 11"H. ~ Heat in the microwave, cool in the freezer. ~ Pads can last years following our care instructions. ~ Bottom compartment has two functions: (1) a stabilizer to hold pad upright while sitting (2) to hold pad in place while lying down.