This is what makes the FLEX product line so special:
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This product line has a much less revealing design from the outside and yet remains true to our ergonomic design concepts. 
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All items of our FLEX Collection are fitted with a horizontal elastic band that gently lifts the genitals into a very roomy pouch that accomodates them very comfortably, without crushing them, and without too much exposure. The penis can be placed sideways or front/down. The illustration shows the typical position of male genitals in most swimwear (A) and in Ergowear FLEX (B and C).
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The fabric is polyamide-elastane, a flexible, durable, fast-drying and breathable combination of polyamide and elastane fibers.
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Although the chemical components are similar to those of microfiber, the yarn thickness and construction is more heavy-duty making it more resistant to water, salt and chemicals. When wet, this fabric will NOT become transparent in any of the colors, but - as all fabrics containing elastane - it will attach closely to the skin and the effect may be quite revealing. This is true whether or not a liner has been inserted underneath. We recommend checking this when you get out of the water and adjusting if needed.