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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Voormi Thermal ll Baselayer Top
Arc'teryx Rho LT Zip Neck
Smartwool Midweight Crew
$50 - $100
Icebreaker Oasis Long Sleeve Crewe
Patagonia Capilene Air Crew
$90 - $129
Helly Hansen HH Lifa Merino 1/2 Zip