BTL 12 Clear Greenhouse CoverNovember 13, 2015 | By Btl Liners 12-mil woven greenhouse material. Fabricated to custom sizes. Allows 88% UV transfer. share forward print Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *CommentName * Email * Website Save my name, email, and website in this browser for the next time I comment.