How to Choose Base Layers

Outfit your little one for outdoor adventures with these lightweight synthetic base layer bottoms from REI Co-op. An elastic waistband makes them easy to pull on.
Imported.
View all REI Co-op Kids' Base Layer Bottoms| Best Use | Multisport |
|---|---|
| Fabric | 200 g/m² 82% recycled polyester/18% spandex (bluesign® approved) |
| Sun-Protective Fabric | Yes |
| UPF Rating | 50+ |
| Moisture Wicking | Yes |
| Underwear Weight | Lightweight |
| Gender | Infants' Toddlers' |
| Sustainability | Contains recycled materials Contains materials that meet the bluesign® criteria From a Climate Label Certified brand |
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From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.

