Designed to safely evacuate larger patients with both comfort and ease. This design has an increased patient surface area, extra padded carrying handles, flame-retardant cover, and additional stirrups offering firmer patient support as well as better weight distribution on the floor. Like the Raven 90C, the OSL has a bi-fold configuration. The cover material is a very durable Nomex/Kevlar blend. Also, a supplemental Back Rest (not shown) to support the patient at both 90Â° and 45Â° angles may be purchased separately.