Here's what other sites are saying:
Our warmest REI-brand base layer, the women's REI Heavyweight Quarter-Zip long underwear top is perfect for hiking, skiing, snowshoeing, mountaineering or cross-country skiing.
Where to Buy
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REI Heavyweight MTS Long-Sleeve Zip T
REI Heavyweight Polartec Power Dry Zip-T
REI Lightweight Quarter-Zip Shirt
Arc'teryx Rho LT Zip Neck
$65 - $125
Smartwool Midweight Crew
Icebreaker Oasis Long Sleeve Crewe
$90 - $109