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DECATHLON

Swimming fins, Tonifin blue

4.7 out of 5 stars from 298 reviews
298 reviews

Our design teams developed these swimming fins for swimmers who want to build up muscle on the back of their legs and buttocks.

These long, semi-rigid swimming fins have an innovative blade at a 38° angle that increases muscle work of the hamstrings and glutes.

ID 8981876

€19.99
Tax included
Color: Blue

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Design benefits

  • muscular workout

    Strengthen hamstrings and glutes thanks to the 38° angle of the fin blades

  • propulsion

    Improve your propulsion in the water thanks to the long blades of these fins.

  • Features

    Design details

    What are swimming fins used for?

    Swimming fins are training accessories that help to make your muscles work harder in the lower body. The efforts you make when exercising will improve your heart rate and strengthen your abdominals and your lower body (thighs, glutes, calves). The efforts you make when swimming with fins burn up fat and tone up your body shape.

    A Decathlon innovation

    A lot of female swimmers use swimming fins to strengthen their legs. Conventional fins focus the effort on the quadriceps and the hamstrings and buttocks work very little.

    We designed these pool fins with a blade at a 38° angle to strengthen these muscles by increasing resistance when the fin moves upwards and decreasing the effort as the fin moves downwards.

    Fin length

    The TONIFINS are long fins.
    - 36-37: 36.5 cm
    - 38-39: 39 cm
    - 40-41: 41.5 cm

    SHORT blade guarantees a good kick frequency and a good cardio workout. Movements are very close to “natural” swimming movements.
    The LONG blade guarantees a more sweeping kick and a stronger muscle workout.
    The long blade of the TONIFINS fins makes the target muscles work harder.

    Fin stiffness

    The TONIFINS are semi-rigid fins.

    Stiffness is characterised by the density of matter. As such, the stiffer a blade is, the greater muscular exertion will be. The more flexible a blade is, the more efficient and sweeping the kick will be. How hard you kick will depend on the type of workout you want to achieve (cardiovascular or muscle).

    Footwear

    The TONIFINS fins have open foot pockets.

    Fin foot pockets hold the foot in place when kicking (important for an efficient kick).
    Open foot pockets allow for greater freedom of movement for your ankles.
    Closed foot pockets hold your feet in their natural position.

  • Usage & care

    Warranty

    2 Years

    Care Instructions

    Storage tips

    Store fins in a dry place.

  • Specifications

    Composition

    Canopy: 100.0% Styrene Ethylene Butadiene Styrene;Slippers: 100.0% Styrene Ethylene Butadiene Styrene

  • Testing

    Test product

    The 150 tests carried out have allowed us to measure an increase in muscle use of 19% on the hamstrings and 27% on the buttocks*. *measurements in comparison with the Silifins fin