portions of said sleeve between said opposite sections having pluralities of folds adjacent one another around said sleeve in a circumferential direction of said sleeve, each of said folds including {HEAD ~ inner angle parts} defining at least a portion of a contact surface for engaging {TAIL ~ a body surface}, said folds forming a spring 
for engaging
portions of said sleeve between said opposite sections having pluralities of folds adjacent one another around said sleeve in a circumferential direction of said sleeve , each of said folds including { HEAD ~ inner angle parts } defining at least a portion of a contact surface for engaging { TAIL ~ a body surface } , said folds forming a spring
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH