Our sleep bags are made from rayon of bamboo, a super soft fabric that’s gentle on delicate skin. These are a cozy and comfortable sleeping alternative to blankets, so you can worry less about SIDS. The sleep bag has a double zipper for quick, easy access during diaper changes and more. Due to lack of quilting, the 0.5 TOG Sleep Bag tends to run bigger and have more stretch. We recommend following our fit guide/rules found in the blog here to determine if it is the correct fit. Exterior: 97% Rayon from Bamboo, 3% Spandex Tog Rating: 0.5 TOG; 23 - 26 °C / 74 - 78 °F TOG is a rating system that measures warmth and calculates how quickly a fabric uses heat. It is the standard when choosing the appropriate sleeping bag for your baby depending on the ambient temperature in their nursery. We recommend a thicker tog during cooler months and a thinner size during warmer months. For children's safety, garment should fit snugly. This garment is not flame resistant. Loose fitting garment is more likely to catch fire. Sizing: Infant Material: 97% Rayon From Bamboo, 3% Spandex Fit: Easy Fit Fabric Name: Quilted Garment Style: Sleeveless, Front Full Length Zipper Neckline: Scoop Garment Details: No Pocket Fabric Weight Type: Lightweight Fabric TOG Rating: 0.5 TOG Care and Cleaning: Machine Wash, Line Dry or Lay Flat to Dry