FirstGear 37.5 Basegear Pants ::

FirstGear 37.5 Basegear Pants (SOLD OUT)

  • Optimal thermal regulation and moisture transfer
  • Provides comfort in variety of conditions
  • Polyester/spandex fabric mix
  • Moves with body without binding

*For health and hygiene reasons riding underwear cannot be returned if the package has been opened.

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Sizing Information

Most people can pick the size they normally wear in pants or shorts and get a good fit. As an example, I have a size XL here and measured the waistband at 35” barely stretched to 41” fully stretched. Most XL pants will be in the 38” range so that is about right.

Our Two Cents

For 2016, FirstGear has re-worked its entire line of Basegear underwear. The new line is all called 37.5 Basegear. What the heck is that you ask? The Basegear line is designed to make you more comfortable when riding by controlling the “micro climate” that exists under your clothing next to the skin. The material wicks moisture and controls humidity, and FirstGear says that humans are most comfortable with a relative humidity close to the skin of 37.5%. So there you go…. the origin of the name. Read more at

These pants are made of a “waffle weave” material that is stretchy and feels nice. The pants have flatlock seams so they are comfortable under your clothes. In the black/blue color, they have sort of a Tron look don’t you think? You’d better get a shirt to complete the outfit! The waistband has some of that grippy rubber stuff so they won’t slide around, and will work great with a shirt tucked in. :: 11-04-15

Happy Customers Who Bought This Product

From: David L.
Location: California

My comment is on the Firstgear 37.5 Basegear Short Sleeve shirts. I was looking for a "Do-it-all" base layer shirt to wear either either alone (directly under my motorcycle jacket in warm weather) or as the base layer with additional mid layers in... (Read more...)

From: Brian J.
Location: Ohio

This cold weather gear functions as it is supposed to. The fit should be snug against your body to preserve your body heat, so go with the size chart. I am 6' tall, 215lbs, 45 in chest, 37 inch waist at the belly button. The L fit me perfectly ... (Read more...)