AK Training Fins

The AK Training Fins are a silicone short-blade training fin designed for regular pool use. Made from durable, chlorine-resistant silicone, they provide a firm yet flexible blade that generates resistance during kick sets — helping to develop ankle flexibility, leg strength, and overall kick technique. The shorter blade profile promotes a higher-frequency kick, making them particularly effective for sprint sets, drill work, and competitive swimmers looking to improve their kick speed and body position.

AK Training Fins are available in eight sizes covering EU 31.5 to 47, with UK equivalents shown in the sizing table below. If your size falls between two sizes, size up for a more comfortable fit.

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Sizing Table — AK Training Fins

Size	31.5–32	33–34	35–36	37–38	39–40	41–42	43–44	45–46	47–48
UK Shoe Size	12–1	1–2	2–3	4–5	6–7	7–8	8–9	10–11	12–13
Fin Length (mm)	210–215	220–225	230–235	240–245	250–255	260–265	270–275	280–285	290–300

Size	31.5–32	33–34	35–36	37–38	39–40	41–42	43–44	45–46	47–48
EU Shoe Size	31.5–32	33–34	35–36	37–38	39–40	41–42	43–44	45–46	47–48
Fin Length (mm)	210–215	220–225	230–235	240–245	250–255	260–265	270–275	280–285	290–300

Usage & Fit Notes — AK Training Fins

If your foot length falls between two sizes, size up. Fins that are too tight restrict ankle movement and can cause discomfort during training.
The short blade profile is designed for a high-frequency kick — most effective for sprint kick sets, drill work, and underwater phase training. Not suited to long, slow kick sets.
Silicone fins will bed in slightly with use and conform to the shape of your foot over time. A snug fit when new is normal.
If you are new to training with fins, introduce them gradually — start with short sets (e.g. 4×50m) and build volume as your legs and ankles adapt to the increased resistance.
The silicone construction is chlorine resistant and durable. Rinse in fresh water after every use and store flat, away from direct sunlight and sharp objects.
Avoid walking on rough or abrasive surfaces such as pool surrounds or concrete, which can damage the blade over time.
Unsure? Contact our team or call +44 1827 330600.

Frequently Asked Questions — AK Training Fins

Measure your foot length in millimetres — stand on paper with your toe against a wall, mark the end of your heel, and measure from the wall to that mark. Use this measurement to find your size in the table above. Shoe size is shown as a secondary guide only. If you fall between sizes, choose the larger size.

Always size up if your foot length falls between two sizes. Fins that are too tight restrict ankle movement and can cause discomfort and cramp during training. Silicone fins will ease slightly with use and conform to the shape of your foot over time.

The short blade profile makes AK Training Fins most effective for sprint kick sets, high-frequency kick drills, and underwater phase work. They are well suited to competitive swimmers working on kick speed, body position, and turns. For longer aerobic kick sets, a longer-bladed fin may be more appropriate — speak to a member of staff at Allens for guidance.

Silicone fins are generally softer, more flexible, and more comfortable than rubber fins, particularly for swimmers with narrower feet. They are also more durable in chlorinated water and resist degradation better over time. Rubber fins tend to be firmer and generate more resistance, which some swimmers prefer for strength training. For most recreational and competitive training use, silicone fins are the preferred choice.

Yes, though beginners should introduce fins gradually. Start with short sets and focus on maintaining good ankle flexibility and kick technique rather than simply swimming faster. Build volume slowly to avoid placing excessive strain on the ankles and knees.

Rinse thoroughly in cold fresh water after every use to remove chlorine and salt. Allow to dry naturally away from direct sunlight. Store flat in a cool, dry place away from sharp objects — do not fold or crease the blade during storage. Avoid walking on rough pool surrounds or abrasive surfaces which can damage the silicone blade over time.