I bought a Rocky Mountain Sniveler and a Mt. Washington 3 Convertible from Jacks-R-Better (JRB), during their Valentine's Day sale and just had a chance last evening to give them a try. As always JRB's products are first rate construction and easy to put on the hammock. I was ready for a "test" lay at around 5:00pm in 45F calm weather. The Rocky Mountain Sniveler, which I'm using as a top quilt, is rated to about 10F and the Mt. Washington 3 Convertible, deployed in full length under quilt mode, is rated to about 15F, so I climbed in with just jeans and a t-shirt, anticipating a short lay. I DIDN'T WAKE UP UNTIL MIDNIGHT!!! By then it was 32F and foggy and I was still toasty warm. I think I would've slept longer but I woke up hungry. I'm considering this test a success .