Thermal Base Layer Underwear Top for Women - Diamondown

Thermal Top for women maintains 91% of body heat and 40% of radiant body heat. Thin and light weight insulated long sleeve top with moisture wicking capaility. Patented revolutionary fiber blend fabric, traps your natural body heat to keep you warm and comfortable.

Diamondown™ cold climate clothing maintains twice the natural body heat compared to any other fiber keeping you warm and comfortable outdoors. Read more about our clothing’s patented technology here. Diamondown is made in America.


  • Proven in extreme conditions
  • Weight – 8 oz per square yard
  • Soft and comfortable
  • Machine wash and dry – will not shrink and long lasting
  • Color – medium gray
  • Sizes – S, M, L, XL, 2XL. View Sizing Chart
  • PLEASE NOTE TALL SIZES ARE SPECIAL ORDERS but we do our best to keep some in stock
  • Made in the USA

Clear selection

Women’s Performance Thermal Base Layer Long Sleeve Top for Women keeps you warm in the winter and cool in the summer – keep your arms warm and comfortable. This are actual customer comments:

The thermal wear was an outstanding success on my trip to Iceland.  When we arrived in Reykjavik on Sunday morning, the wind was blowing, there was sleet and the temperature was hovering around freezing. The thermal wear provided the protection you warranted.  I was quite comfortable. The light down jacket I wore was a very thin jacket that you could almost see through, it was nothing like the heavy ski jackets that we took on the trip. The heavy ski jackets and ski pants never got unpacked once we saw how effective the Diamondown was.  While the wind chill and drizzle, certainly brought the temperatures close or below freezing.  We visited glaciers, frozen bays, iceberg bays, and the Atlantic seaside with glacier ice floating in it along with frozen waterfalls and hot springs.  We kept the Diamondown on for the entire one-week trip. My wife, who does not like to wear socks, wore the Diamondown socks for the duration of the one week trip and was quite pleased as she admitted, “Well, for socks, they are pretty good.” And that is really high compliment as to how effective the thermal wear was.  As with most women, her feet are always cold, but not so on this trip.  She is a believer.


2 XL, Large, Medium, Small, XL

There are no reviews yet.

Be the first to review “Women’s Performance Thermal Base Layer Top”