Open heel design with adjustable strap allows you to wear fin socks or diving booties to protect you feet from cold and blisters.<Br/>feature: <br/>adjustable strap allows convenient adjustment for proper tightness and easy put on and remove the fins.<Br/>open heel provide convenience to wear a fin sock or diving booties to protect your feet (you are suggested to choose a bigger size if wear with diving booties).<Br/>drain hole is to outlet the water in time and streamlined body effectively reduce the water resistance for free exploration underwater.<Br/>superior tpr constructed, tough but flexible, neither too hard nor too soft for free action in the water.<Br/>specification: <br/>material: tpr &#43; pp<br/>application: adults / kids (optional)<br/>size: s-m / l-xl (optional)<br/>color: black / blue / red / yellow (optional)<br/>weight: 590-945g / 1.3-2.0Lb <br/>package weight: 600-955g / 1.3-2.1Lb<br/>size chart:<br/>size <br /> eu<br /> us<br /> inner length<br /> total length<br /> width <br /> height<br/>adults <br /> s/m<br /> 37-41<br /> 4-8<br /> 22.0Cm/8.6In<br /> 40.2Cm/15.8In<br /> 18.6Cm/7.3In<br /> 7.5Cm/2.9In<br/>l/xl<br /> 42-45<br /> 9-11<br /> 24.3Cm/9.5In<br /> 42.8Cm/16.8In<br /> 19.2Cm/7.5In<br /> 9.0Cm/3.5In<br/>kids <br /> s/m<br /> 24-29<br /> 9-13<br /> 17.5Cm/6.8In<br /> 34cm/13.3In<br /> 16.8Cm/6.6In<br /> 6.0Cm/2.3In<br/>l/xl<br /> 30-35<br /> 1-4<br /> 19.5Cm/7.6In<br /> 37.2Cm/14.6In<br /> 17.5Cm/6.8In<br /> 7.0Cm/2.7In<br/>package list: <br/>1 * pair of diving fins