The Pro-Sled Travel Cover from Otter Outdoors protects your gear and keeps it securely onboard while you travel. Heavyweight polyester fabric is extremely durable and waterproof and lasts for years. The shock cord sewn into the hem seals out snow, slush, water and mud. Imported. Available: Medium Fits the Otter Medium Pro Sled and Medium Wild Sled. Magnum Fits the Otter Magnum Pro Sled and Large Wild Sled. Type: Sled Covers.