I love my hot water bottle. Before I go to bed each night I slip it under our down comforter to ensure my side of the bed will be cozy and warm. I made the cover with 100% wool felt - so soft! Before I purchased the actual bottle, I read a lot of reviews and decided on the Fashy brand. It stays warm all night and I would highly recommend it. A classic comfort, and a wonderful handmade gift, especially with the addition of a personalized monogram.