Due to being two jackets attached, KOWARI has a massive temperature range. The out jacket is a lightweight that can protect you and your baby down to 10 degrees and the inner one is great down to 5 degrees. Both jackets combined create an insulation layer between the two of them which allows for extra warmth and should keep you both warm down to -5 degrees depending on humidity. Like all Wombat products, KOWARI is windproof, shower proof and water repellent.