76% Polyester, 24% Merino Wool
Here's what other sites are saying:
Is it just you or do your baby's eyes light up when the snow starts falling' Open the shoulder snaps on The North Face Infant Boys' Baselayer Top and easily slide your little snowman in. Then pull on the Baselayer Bottoms and take him outside for a winter adventure. A soft blend of polyester and merino wool itchlessly insulates and wicks moisture for comfort. Diaper snaps let you attend to poop duty.
- Backcountry.com refers to the kids' version
Made from a comfortable, striped blend of polyester and soft merino wool, The North Face Baselayer Set is the ultimate base layer for any winter activity.
- EMS refers to the kids' version
The first measure of defense against the cold is a solid baselayer. Keep toddlers protected during winter with this top and bottom baselayer set. Comfortable, double-knit merino wool fabric naturally wicks moisture away from skin to keep toddlers dry at the base. All-over stripe.
- The North Face refers to the kids' version
A comfortable, striped merino wool blend double-knit makes this the ultimate base layer for any winter activity. Crew neck. Self fabric collar binding. Exposed elastic waistband. Screen-printed logo at left chest. Ultraviolet Protection Factor (UPF) 50. 219 g/m2 76% polyester, 24% merino wool piece-dyed striped double-knit. Inseam: 14". 162.87 g (5.74 oz).
- Rocky Mountain Trail refers to the kids' version