My newborn runs H-O-T! She has fleece & cotton swaddlers and they both make her sweat profusely even though it's cool in the house. She runs so hot she only wears a diaper, onsies have her sweating. As a typical newborn she feels most secure being swaddled so I started researching materials I could use and came across muslin fabrics, which are used often in New Zealand and Australia. After reading several reviews about this particular brand I decided to go ahead and purchase their swaddlers even though it was a little more than I had wanted to spend. Boy do I feel like it was money well spent! The material is soft and lightweight and has lasted through several washings (newborn = lots of spitup and ****). I can keep her wrapped all night without her sweating at all. Added bonus: these swaddlers are so large they can do double duty as car seat cover. This will be great during the summer when I'll want to keep her covered from the sun with something lighter than a blanket.