This sleep sack is suitable for year-round use in the rooms where the temperature fluctuates from 66°F - 79°F (19°C to 26°C). It is perfect for spring, summer, fall, and for warmer rooms in winter. 

We start by offering an inner layer of NON-superwash high-quality, 100% merino wool that directly touches your baby’s skin. Our second outer layer is a high-quality, ecologically friendly 100% organic cotton in print "sheep", which wraps the merino wool gray inner layer with its breathable shell allowing the two fabrics to work together for your child’s ultimate comfort and cosines.

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.