TWF Kids Shortie Wetsuit Size Guide

This size guide covers TWF Kids’ Shortie Wetsuits, including the Seahorse & Pirate Summer Shorties (2mm neoprene) and the Turbo Shortie (2.5mm neoprene). All suits feature flatlocked stitching, a zip with velcro lock, no underarm seams, and UPF 50+ protection — ideal for beach and sea use in summer conditions.

Sizing is based on chest circumference and neck-to-crotch length. Always use body measurements rather than age alone — children of the same age can vary considerably in size. Use the size code when ordering.

Shop Girls’ Wetsuits → Shop Boys’ Wetsuits →
Body Measurement Points
TWF kids wetsuit measurement guide showing chest and neck to crotch measurement points
How to Measure

Use a soft tape measure and take all measurements directly against your child’s skin. Age is shown as a guide only — always use body measurements to find the correct size.

  • A
    Chest Measure around the fullest part of the chest, keeping the tape horizontal and snug but not tight. This is the primary sizing measurement.
  • B
    Neck to Crotch Measure from the base of the neck, down the front of the body to the crotch. This confirms the body length of the suit will be comfortable.

If measurements fall between sizes, size up. Wetsuits should feel snug but should not restrict breathing. Wrists, ankles and neck should be snug with no excessive bagginess in the underarm or leg area.

Sizing Table — TWF Kids’ Shortie Wetsuits
Code Age (guide) Chest (cm) Neck to Crotch (cm)
K02 1–2 yrs 52 36
K03 2–3 yrs 54 38
K04 3–4 yrs 56 40
K06 4–6 yrs 58 42
K07 6–7 yrs 62 44
K08 7–8 yrs 64 46
K09 8–9 yrs 68 49
K11 10–11 yrs 72 52
K12 11–12 yrs 77 54
K13 12–13 yrs 80 55
K15 14–15 yrs 85 56

All measurements are body measurements, not garment measurements. Age ranges are a guide only — always use chest and neck-to-crotch measurements to select the correct size. Use the size code when ordering.

Fit Notes — TWF Kids’ Shortie Wetsuits
  • Always size by chest and neck-to-crotch measurements, not age alone. Children of the same age can vary considerably in size — body measurements give a much more accurate fit than age guides.
  • A correctly fitted wetsuit should feel snug all over. Some reduction in range of motion is normal and expected — this is not a sign the suit is too small, provided breathing is not restricted.
  • The fit should not be too loose. A baggy wetsuit lets water flow freely through the suit, losing all the benefits of trapped water being warmed by the body. Wrists, ankles, and neck should all feel snug.
  • Some bagginess at the small of the back is normal and not a cause for concern.
  • If measurements fall between two size codes, size up for comfort and ease of movement.
  • The Seahorse & Pirate Shorties are 2mm neoprene with a polyester lining. The Turbo Shortie is 2.5mm with a mesh chest and back panel for additional wind chill reduction. Both are suitable for beach and sea use with UPF 50+ protection.
  • Rinse in fresh water after every use and hang to dry away from direct sunlight. Do not tumble dry, iron, or store folded when wet.
  • Unsure? Contact our team or call +44 1827 330600.
Frequently Asked Questions — TWF Kids’ Shortie Wetsuits

Measure your child’s chest circumference and neck-to-crotch length, then match both measurements to the size table above. Use chest as the primary guide and neck-to-crotch as a secondary check. If measurements fall between two size codes, size up. Always use body measurements rather than age alone.

The Seahorse and Pirate Summer Shorties are 2mm neoprene with a polyester lining — ideal for high summer use and lighter conditions. The Turbo Shortie is 2.5mm neoprene with a mesh chest and back panel for additional wind chill protection, making it suitable for slightly cooler conditions. All three share the same size chart.

Size up. A wetsuit that is slightly too large is more comfortable and easier to move in than one that is too small. If the larger size feels significantly too big across the chest or has excessive bagginess in the legs or underarms, the smaller size may give a better fit overall — contact our team for advice.

The TWF size code refers to the age range the suit is designed for, not a sequential size number. K06 covers ages 4–6, K07 covers 6–7, and so on. Some codes are skipped because TWF does not produce a separate size for every single year group — the available sizes are K02, K03, K04, K06, K07, K08, K09, K11, K12, K13 and K15.

A correctly fitted wetsuit should feel snug all over, with wrists, ankles, and neck fitting close to the skin. Some reduction in range of motion is normal. The suit should not be so tight that it restricts breathing. If it feels baggy anywhere other than the small of the back, it is likely too large and will let water flush through freely.

TWF shorty wetsuits are designed for beach and sea use — paddling, dipping, and general water play in open water conditions. They provide UV and wind chill protection rather than the high performance buoyancy of a dedicated open water swimming wetsuit. They are not designed for pool use.

Rinse thoroughly in fresh water after every use to remove salt, sand, and sunscreen. Turn inside out and rinse the interior as well. Hang to dry away from direct sunlight — prolonged UV exposure degrades neoprene over time. Do not tumble dry, iron, or store folded when wet. Store on a wide hanger to maintain the shape of the shoulders.