What does wetsuit thickness mean?Updated 20 days ago

Wetsuit thickness (in mm) indicates thermal insulation:

• Thicker = warmer, less flexible
• Expressed as e.g. 4/3 mm:
  • First number = torso
  • Second = limbs

Quick guide:

• 2mm or less → Warm water / summer (>17°C)
• 3/2mm → Spring / autumn
• 4/3mm → Winter / cold water
• 5/4mm or 6/5mm → Very cold conditions

For best performance, your wetsuit should fit snugly to prevent water entry.