I have ordered several pairs of these items for my 3.5 year old. I ordered a medium and they fit him perfectly and will (hopefully) be good for next fall/winter. They're not too fat for him to sweat. I ordered Wintersport Smart wool socks for skiing and snowy days. Great price too. Smart Wool has never let us down.
Ultimate Durability: Carhartt Boys Camp Crew Sock 6 Pair Pack
45 Review
Aminson Grip Ankle Socks: Non-Skid Slipper Crew Socks for Kids Boys and Girls - 6/12 Pairs
49 Review
Boys' Gold Toe Ultra 𧦠Tec Back Stripe Crew Socks, 5-Pack
46 Review
Jefferies Socks Boys Seamless Toe Crew Athletic Socks 6-pack
47 Review
π Fruit of the Loom 6 Pair Cushion Ankle Boys' Clothing: Comfy and Stylish Selection for Active Boys
57 Review
π₯ Stay Warm and Active with Rocky Fleece Thermal Underwear Bottoms for Boys
44 Review
Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
64 Review
Funny Guy Mugs Tearaway Sweatpants: Playful Boys' Clothing for Fun and Active Days
49 Review