The S123 adds resistance to legs during kick sets. Assists ankle recovery from breaststroke kick and adds resistance to abdominal muscles during dolphin kicks.

Available in five resistance levels.

Color          Resistance (1bs)*        Resistance (kg)*
Silver                  3-8                              1.3-3.6
Yellow                5-14                             2.2-6.3
Green                 8-24                            3.6-10.8
Red                     12-31                           5.4-14.1
Blue                    14-34                          6.3-15.4
*resistance when stretched 1-3 times original length