Check the listing for details. NWT Smartpak SmartCore Rain and Fly Sheet Duo System 87". Color: Grey, Condition: New. Listed at 65.00 USD. This is a new Smartpak SmartCore Rain and Fly Sheet Duo System in a size 87". It is a convenient solution to quickly-changing spring and summer weather. When shower surprises or rain is forecast simply attach the waterproof top sheet over the fly layer with hook and loop closures. It's ripstop exterior is lined with SmartCore fabric working with the fly sheet's breathable mesh to regular the temperature of your horse and wick away sweat. Made from a lightweight mesh, the fly sheet keeps your horse cool and bugs off blocking up to 70% of harmful UV rays to protect his skin and coat from the sun. Lined shoulders help prevent rubs and a large tail flap and belly band closure offer even more coverage against flies and insects.