Safer sleep is better sleep and preventing babies from overheating is an important part of safer sleep. The Tommee Tippee sleep bag range is available in four different TOGS (warmth ratings) so that you can dress your baby safely for the room temperature: 3.5 TOG: ideal for cold winter months and for cold rooms below 14°C Made from soft, 100% cotton-rich, fluorescent-free fabric our sleep bags are snuggly and kind on baby's skin - perfect for a comfortable night's sleep. Our sleep bags have been designed to be snug up top and wriggly down below - slim fitting through the chest to enable full freedom of movement without restriction or excess bulk with a roomy, hip-healthy bottom to allow your baby to adopt a natural “frog-legged” sleeping position, which is important for correct hip development. Should your little one need changing during the night, there's easy zip access to help you deal with those night-time nappy changes without disturbing baby.