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DeFeet UnD Shurt Sleeveless Base Layer

Some consider the UnD Shurt Tank as the world's first base layer. During the time of it's arrival on the scene, we would estimate over half the European peloton was using one. The design hasn't changed and doesn't need to. It is a snug fitting tailored shirt that fits like a second skin, void of bunching and sagging fabric. Beyond fit, the wicking and venting is superb. It is no wonder that we sell tons of these winners with each passing season.

The UnD Shurt Tank is constructed from DeFeet's 3oz knitted mesh MicroSupreme acrylic fiber. These fibers produce a unique polarity of acrylic which quickly draws moisture away from your skin to the outer layers of the base layer and then to your jersey. Keeping you dry and cool is what the base layer is all about. This fabric offers almost unmatched comfort due to the soft and fine hand which is much akin to cashmere. All ends are double stitched and hemmed for durability when riding and washing the garment. The combination of fit, comfort and performance is the perfect trilogy in creating a fantastic base layer and the UnD Shurt excels in all three fields.


  • MicroSupreme acrylic construction
  • Tailored and anatomic fit
  • Soft and comfortable
  • Vented and breathable
  • Excellent wicking capacity
  • One of our best sellers
  • Supreme value

From $22.49

Sale Price
Reg Price $29.99
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DeFeet Sizing Chart

US Mens5-99.5-13
US Womens8.5-10.511-13
Armskin Arm Warmers
UnisexUnder 5'9" & 165lbsOver 5'9" & 165lbs
Un D Shurt Base Layers


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Average Rating:


Posted on 5/14/2012

The Defeet Un D Shirt is soft,light,comfortable and feels great next to the skin. It keeps me cool and dry during and after a long ride. Good performance at a great price. Highly recommended. Thanks Excel.

Pros Moisture Wicking fabric works well.Quality.Price

Cons None


Posted on 2/10/2012

Very comfortable and a wide temperature range. It is too light for very cold weather, but just right for anything else.


Posted on 1/28/2009 2:01:24 PM

The UnDshurt is a great product for the money. I have not used other similar products from other companies, but you can’t beat the price of the UnDshurt.