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Immersion Research M's Penstock Shorts

Availability: In stock (1)

Versatile shorts designed for everyday use

The Men's Penstock Hybrid Board Shorts are stretchy, functional shorts that excel on and off the water.

Made using lightweight, fast-drying polyester, the Penstock Shorts offer a slim but comfortable fit. A zip fly and lace closure make a secure fit at the waist. Spacious front pockets with mesh drains offer enough space for cell phones, keys, and other essentials while allowing water to quickly flow through rather than billowing up. A rear zipper pocket offers storage for your wallet. Casual, comfy, and capable, the Penstock Men's Shorts will quickly become your favorite shorts. 

  • For the Blue Raspberry and Salted Caramel Penstock Shorts, IR suggests ordering one size larger than usual (ex. You're a 32, order a 34)


  • Packaged in a Reusable Lunch Bag made from scrap fabric
  • 4-way stretch wicking polyester fabric
  • Zip fly for relief
  • Front pockets with mesh drain
  • Rear zip pocket with mesh drain
  • Available sizes (28-40 even, 33)


  • Fabric - 91% Polyester, 9% Spandex
  • Fabric Weight - 195 g/m²
  • Country of Origin - Thailand


Size Half Waist (inches) Inseam (inches)
28 14.75" 11.75"
30 15.75" 12"
32 16.75" 12.25"
33 17.25" 12.5"
34 17.75" 12.5"
36 18.75" 12.5"
38 19.75" 12.5"
40 20.75" 12.5"


How to measure the 'Half Waist'
Find your favorite pair of jeans or shorts, close the fly and waist closure and make the top of the front and back waistband straight and level. Measure from edge to edge on the top of the waistband, and find that measurement on the chart to pick your size.


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