For living in the colder climates we offer naturally a warmer, 2-layer 100% merino wool Sleep Sack. It provides extra warmth and ultimate coziness. 
This sleep sack is suitable for cooler rooms from 17C to 24C, it's perfect for fall, winter, and spring.

We start by offering an inner layer of NON-superwash high-quality, 100% merino wool that directly touches your baby’s skin. The second outer layer is NON-superwash high-quality gray 100% merino wool.
Upon instant contact, merino wool is naturally temperature-regulating in both cold and hot climates. This feature creates optimal comfort for baby and child immediately improving their sleep quality.
Because merino wool is super-soft, its effects are immediate on your child as it creates an instant soothing, tactile effect on their skin, which in turn comforts, relaxes, and creates a sense of cosines along with well-being for them.