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2. Triathlon equipment - Wikipedia

   en.wikipedia.org/wiki/Triathlon_equipment

   Specific rules vary by event, but typically the legality of racing in a wetsuit depends on the water temperature on the day of the event. Wetsuits are disallowed if the water temperature is above a specified threshold and become mandatory if the water temperature is below and optional between the two, for example the British Triathlon rules ...

3. List of diving environments by type - Wikipedia

   en.wikipedia.org/wiki/List_of_diving...

   Water temperature, visibility and movement also affect the diver and the dive plan. [3] Diving in liquids other than water may present special problems due to density, viscosity and chemical compatibility of diving equipment, as well as possible environmental hazards to the diving team.

4. Wetsuit - Wikipedia

   en.wikipedia.org/wiki/Wetsuit

   Some suits are arranged in two parts; the jacket and long johns can be worn separately in mild conditions or worn together to provide two layers of insulation around the torso in cold conditions. Typically, two-piece cold water wetsuits have 10 to 14 mm combined thickness of neoprene over the torso and 5 to 7 mm single thickness over the limbs.

5. List of diving hazards and precautions - Wikipedia

   en.wikipedia.org/wiki/List_of_diving_hazards_and...

   Water carries heat away far more effectively than air. Evaporative cooling on the surface is also an effective mechanism of heat loss, and can affect divers in wet diving suits while travelling on boats. [46] Diving suits are available that are suited to a wide range of water temperature down to freezing. [47]

6. Competitive swimwear - Wikipedia

   en.wikipedia.org/wiki/Competitive_swimwear

   Most competitive swimmers wear special swimsuits including partial bodysuits, racerback styles, jammers and racing briefs to assist their glide through the water thus gaining a speed advantage. For diving in water temperatures above 25 °C (77 °F), special bodysuits called "dive skins" are worn.

7. River surfing - Wikipedia

   en.wikipedia.org/wiki/River_surfing

   A requirement for this is a flowing water with shallow depth in which the inertia of the water overcomes its gravity due to the supercritical flow speed (Froude number: 1.7 - 4.5, surpassing 4.5 results in direct standing wave [5]) and is therefore neither significantly slowed down by the obstacle nor pushed to the side.