ErgoCocoon AIR by ErgoPouch is the worlds' thinnest swaddle with special designed see through stretch bamboo fabric, which has great thermal properties (2 degrees cooler/warmer when hot/cold) and is perfect for summer. For 2-6 months old, please refer to http://www.babymore.com.au/product/ergopouch-ergococoon-air-swaddle-natural-2-6-months/ For 6-12 months old, please refer to http://www.babymore.com.au/product/ergopouch-ergococoon-air-swaddle-natural-6-12-months/