Never used. Bought for myself and never used. Bought from amazon.

DMI Heel Cushion Protector Pillow to Relieve Pressure from Sores and Ulcers, Foot Pillow, FSA HSA Eligible, Adjustable in Size, Blue, White, Sold as a Set of 2

https://www.amazon.com/gp/product/B0009STNCO/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1