How to Choose Base Layers

This SENIQ base layer top balances warmth, performance and comfort. It's made from 100% merino wool for breathable warmth and natural moisture wicking. It's also odor-resistant.
Earn 2x card rewards Instead of 5%, earn 10% in card rewards†on REI purchases—even sale items—with your REI Co-op® Mastercard® Sep 18–28. Terms apply. Learn more
Imported.
View all SENIQ Women's Base Layer Tops| Best Use | Multisport |
|---|---|
| Shirt Type | Mock / Turtleneck |
| Fabric | 100% merino wool |
| Moisture Wicking | Yes |
| Underwear Weight | Lightweight |
| Sleeve Length | Long Sleeve |
| Thumbholes | Yes |
| Gender | Women's |
Adding a review will require a valid email for verification


Buy a lifetime $30 membership and make a $50 purchase by Nov 12, 2026.*
$11
10% Reward*
on this and every eligible full-price item*
+
$30
Bonus Card*
valid for 30 days after joining*
=
$41
Value