It's insanely warm. My 3 year old goes to a forest school, we live in Kentucky so it's not terribly cold but the temp drops to 10(F) and his teachers actually asked me to stop wearing this shirt at all because he was crying he was hot and sweaty in 15 degrees and 5 inches of snow π . So far it's holding up great. Runs a little small, or maybe very true to size, other than that it should work with the base layer. It fits him well now, but I factored in room for growth and not a lot of extra space.
Boys 3D Graphic Hawaiian Aloha Short Sleeve Dress Shirt Tops with Button Down - Sizes 2-8 Years by Uideazone
47 Review
Van Heusen Sleeve Dress Poplin
42 Review
Kid Nation Kids' Tagless Long Sleeve V π Neck T-Shirts 4-12 Years - 2 Packs and 3 Packs
45 Review
The Good Day Lab Clean Shield: Ultimate Comfort and Breathability in Tagless 4-Way Stretch Polo
43 Review
π Fruit of the Loom 6 Pair Cushion Ankle Boys' Clothing: Comfy and Stylish Selection for Active Boys
57 Review
π Bold Pack Sleeve Active Hoodie Sweatshirt Set for Boys' Clothing - Stylish and Comfortable!
47 Review
Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review
Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
64 Review