At Kinder Industries we pride ourselves on building the highest quality custom marine canvas right here in Bristol, RI, USA! The J 40 Winter Boom Tent Cover is made to fit your specific needs. Our winter boat covers are designed to last for years and protect your investment. The heavy duty Top Gun fabric lashes tight using multiple point tie-downs to resist chaffing. If you are looking for the best winter cover for your J 40, you have found it!