The raised cable pattern along the center section—the voluminous weave—creates additional air pockets that retain heat.
The tight knit without large holes makes the fabric quite windproof, which is important for walks in cool weather.
The hood protects baby's head from wind and cold; it's knitted in the same pattern.
The ribbed cuffs on the sleeves and legs fit snugly, preventing cold air from penetrating.
The button closure in the center makes it easy to put on and take off the jumpsuit without disturbing your baby, and also allows you to adjust the level of insulation (for example, unbutton it if it gets too hot).
The material is most likely a wool-acrylic blend: this combination makes the jumpsuit warm yet soft enough for baby's delicate skin.
Seasonality: The jumpsuit is suitable for fall and spring as a base layer, and in winter as a midlayer (underlayer) under a sleeping bag or insulated jumpsuit. The comfortable temperature range is approximately +5 to +15°C as a standalone option and down to -10°C as an insulating layer.
