You will hardly find anything to keep your kids warmer than merino wool blend thermal base layers.
Buy best thermal underwear for women
Kids Thermals in Merino Wool and Silk - Keep Legs Warm
Kids Base Layers & Thermal Underwear, Buy online
Child's Merino Wool & Silk Thermals/PJs - Top (1-14y) - Woollykins
, These soft, wool/silk fine rib leggings for women can be worn as an underwear base layer during the winter months or on their own during the warmer
Engel Organic Wool/Silk Women's Fine Rib Underwear Leggings
Kids Thermal Leggings Base Layer, 70% Organic Merino Wool and 30% Silk (GOTS Certified) * Thermal underwear made from merino wool wicks moisture
Kids Thermal Underwear Leggings, Organic 70% Merino Wool 30% Silk, 2-15 years
ENGEL Organic Wool-Silk Undershirt with Long Sleeves, Striped
Kids Thermal Underwear Leggings: Base Layer Long Johns Pants, Organic Merino Wool and Silk, 2-15 Years (EU-92/2-3 Years, Grey Melange): Clothing, Shoes & Jewelry
ENGEL Kids Long Sleeve Thermal Base Layer Top, Merino Wool and Silk, 2-15 Years
Men's Long-johns in Merino Wool and Silk
Women's Wool/Silk Leggings Organic Merino Wool - £53.80
Thermal Underwear Leggings for Women – Merino Wool Base Layer Long