Good winter socks are thick and warm and wash/dry well. Unfortunately they look longer in the photos than they really are, so they're not quite suitable for wearing under winter boots, which is why we bought them. Would have sent it back if our son hadn't already torn up the packaging and was therefore unable to return it.
SKINS Unisex Essentials MX Compression Calf Tight
49 Review
Warm and Soft Wool Socks for Kids - Cute Animal Design, Thick Thermal Crew Socks for Children and Toddlers in Winter
43 Review
Jefferies Socks Little Seamless Organic Girls' Clothing
44 Review
Girls Winter Fleece Lined Tights Girls' Clothing
46 Review
Eocom Pairs Childrens Winter Animal Girls' Clothing
64 Review
C9 Champion Girls Supersoft Bright Girls' Clothing and Active
46 Review
Amazon Essentials Little Short Sleeve Leotard Girls' Clothing for Active
61 Review
Thermajane Girl's Cozy and Comfy Thermal Underwear Long Johns Set with Fleece Lining
46 Review