energy in untying the lace instead of bringing the two portions 12 a and 12 b closer together the best results were obtained with a linkage 15 obtained with a linkage made of kevlar or aramid and whose outer diameter is between 2 and 4 mm fig3 shows a detail of the lace up device in the area of the gripping device 1 and its rigid frame 3 this frame 3 comprises a contact surface 4 which is complementary of at least three fingers 25 x 25 y and 25 z of the hand m this contact surface 4 comprises three cavities 4 x 4 y and 4 z which assume the morphology of the fingers 25 x 25 y and 25 z respectively when folded around the frame 3 tests have shown that to obtain a more powerful tightening the fingers used preferably are the forefinger second finger and third finger in addition in the preferred embodiment shown the frame 3 also serves to close the loop 2 constituted by the linkage 15 the gripping device 1 includes hooking zones or connection arrangements 5 c and 5 d that are adapted to cooperate with the two ends or end portions 15 c and 15 d respectively of.