Men's Calasa Tech Swim Trunks UPF 50+

Men's Calasa Tech Swim Trunks UPF 50+ is rated 3.7 out of 5 by 49.
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Double-layered, double the value! The Men's Calasa Tech Swim Trunks feature a versatile, double-short design, with a detachable inner liner and lightweight, quick-dry, water-repellent woven outer short. Get the look of a board short with a secure inner liner. Detach the inside liner and use the outer Tech Trunks as a great pair of everyday shorts. Made in our top-of-the-line Aqua Plus Lite™ UPF 50+ fabric, you just might declare these our best mens trunks yet!

  • UPF 50+
  • Snap front closure with zip fly and back elastic waistband with hook and loop fastener adjustment on sides for custom fit
  • Sunglasses loop at waistband
  • Front pockets and invisible zipper leg pockets
  • Back yoke panel for added mobility
  • Detachable knit liner shorts
  • Aqua Plus Lite™ fabric: Water repelling with 4-way stretch and quick dry performance. Chlorine and saltwater resistant

Size & Fit

  • 9" inseam


Aqua Plus Lite™ Fabric

Our Aqua Plus Lite fabric is a lightweight woven treated with a Durable Water Repellent (DWR) finish so that water beads-up and rolls off the surface. Intelligent features like subtle 4-way stretch and quick-dry make this UPF 50+ fabric ideal for swim trunks and activities on and in the water.

Polyester/Spandex blend

Recommended by The Skin Cancer Foundation

All Coolibar fabrics have been approved as an effective UV protectant for covered areas. Coolibar is the first clothing company to receive The Skin Cancer Foundation’s Seal of Recommendation.

Not Recommended For

active fitness, not moisture-wicking and may cause overheating

Care Instructions

Machine wash cold, tumble dry low

Men's Bottoms Size Chart

Size Waist
in inches
in inches
S 28-30 34-36
M 32-34 38-40
L 36-38 42-44
XL 40-42 45-47
XXL 44-46 48-50
XXXL 48-50 52-54
Tall - MT 32-34 38-40
Tall - LT 36-38 42-44
Tall - XLT 40-42 45-47
Tall - XXLT 44-46 48-50
Size Waist
in cm
in cm
S 71-76 86-91
M 81-86 97-102
L 91-97 107-112
XL 102-107 114-119
XXL 112-117 122-127
XXXL 122-127 132-137
Tall - MT 81-86 97-102
Tall - LT 91-97 107-112
Tall - XLT 102-107 114-119
Tall - XXLT 112-117 122-127
Size guide
Rated 1 out of 5 by from Poor sizing and fit Sizing is way off. Large is too large, does not fit a 34" waist. The elastic cinching in the back is awful, gives the appearance of little kids pants/shorts. Way more pronounced than what is shown in the model images on site.
Date published: 2022-06-07
Rated 4 out of 5 by from I can do lunges Very lightweight. I think they run a tad on the small side, but not by much. I bought this for kayak fishing where my previously purchased swim tights will fit perfectly underneath. The same connection points apply. I’ll try them tomorrow.
Date published: 2022-04-22
Rated 1 out of 5 by from Needs reworking, but great concept I received this suit, and the inner liner fit great. The size of the outer shorts was not just mismatched, but the connection was inadequate. They were set up in a way that basically they would always be low riding when wet, with no available way to tighten adequately. I would strongly prefer to have a sewn-in liner to the versatility of detachable shorts. That would make these the most comfortable and nice looking suit I have found. Please consider updating the model. 9 inch inseam is great. Colors were great. Liner was great. I liked it well enough I almost figured out how to sew so I could fix them, but that was a daunting task for me, so I ended up returning.
Date published: 2022-04-20
Rated 2 out of 5 by from Less than pleased I bought one, and then a second pair because I thought these were perfect for me. Unfortunately, while the inner liner fits fine, the trunks themselves are just a tag big in the waist and the side velcro adjustors simply do too little, especially when swimming in the waves of an ocean. The trunks kept falling down. I tried to insert a shoelace since virtually all of my other swim suits have strings to keep the waist tight, but this is not possible because of a midline seam. There should have been a tie to keep them snug. I will only use these in a limited fashion and never when in an ocean.
Date published: 2021-08-30
Rated 4 out of 5 by from Size L way too big the waist of the trunks is way too wide for 34" width, although the underneath tights width is perfect. Returned the product and purhased size M instead, where the trunks waist is perfect for 34" waist but they are too short at the crouch (naturally suitable for size 30" - 32"). Of course the tights are way too small. Thus, the only solution would be to readjust the Size L waist
Date published: 2021-08-14
Rated 1 out of 5 by from poor fit returned because internal liner waist didn't fit with exterior shorts, very bunchy
Date published: 2021-07-14
Rated 2 out of 5 by from Fit is off I agree with many of the other reviewers about the fit of these trunks. I’m a very satisfied Coolibar customer, but in this case I knew immediately that something wasn’t right. The inner liner fits just fine, but the outside outer shorts are way too big, even though other Coolibar products have always fit well in my size (medium). You can use the tie to help secure the waste, but the predictable effect is bunching below the waste. Not sure what to do with these. I’ll probably just put them away and forget about them. Unfortunate.
Date published: 2021-07-06
Rated 2 out of 5 by from I want to love them but the sizing is just wrong I want to love these as they are very nice. I like the separate liner, look and feel of these but the sizing just isn't right as the shorts themselves sizing doesn't match the liner sizing. Even though I'm a large by measurement in my experience trunks are always big and baggy so I typically purchase mediums. I originally did that and the outer short size was perfect in a medium, but the liner was way too tight. I returned them and bought a large. Now the liner is perfect and the shorts are too large. Just a really poor inconsistent fit. Honestly I want these, but unless I had the medium outer short and the large liner it just doesn't work. Separately for the premium these are why do you charge a return mailing fee. That is crazy especially when the sizing is off and no happy middle.
Date published: 2021-06-12
  • y_2022, m_6, d_29, h_21
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.32
  • cp_1, bvpage1
  • co_hasreviews, tv_22, tr_27
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