Berchtold Operon Surgical Pads Bariatric Comfort Series: Bariatric Surgical Pads for Berchtold Operon OR Tables. Designed with the comfort of bariatric patients in mind. Recommended for low - high risk bariatric patients. 4” thick overall. Constructed of high density firm foam, Medium Firm High Density foam, and a layer of anti-sheer Pro-tek Memory foam covered with 4-way stretch ultra soft vinyl. Fits Berchtold Operon D8500 Surgical Table.