Trailerable Snowmobile Snow Machine Sled Cover Ski-Doo Ski Doo Formula Deluxe 670 1999 Color: Black. Package includes: Great Quality, Trailerable Snowmobile cover , storage bag. Our snowmobile covers are manufactured from technologically advanced 600 Denier, woven polyester material to protect your snowmobile all year round. This cover has a fully elastic bottom for secure fit and to to keep the cover in place, plus it is equipped with heavy-duty traileing system ans fuel tank access door. Equipped with hood liner on the inside. Designed for Storage and Trailering purposes