Why does cotton feel cold when a child sweats?
Cotton absorbs moisture and dries slowly. Wool or a wool blend often feels drier while kids play outdoors.
Cotton feels soft, safe and familiar — and it's often a great material for indoor clothes, pyjamas and quiet days. But as a base layer under outerwear, cotton isn't always the smartest choice, especially when the child runs, sweats or plays outside in damp weather.
The reason is simple: cotton soaks up moisture and holds it close to the body. When the fabric becomes wet from sweat, rain or snow, much of the warm air that normally helps insulate disappears. Damp fabric can also feel cold as water evaporates from the garment. So a child who was just warm and active can quickly start to feel chilly once the play calms down.
Wool works differently. Wool fibres can absorb moisture vapour without the garment feeling instantly wet against the skin. That doesn't mean wool is magic or always dry, but it can help the child feel more evenly warm as temperature and activity levels shift. That's why wool, wool blends or certain synthetic technical materials are often smarter next to the skin under shell garments, snowsuits or rainwear.