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An attachment of a fin to an adjustable fin holder of a surfboard or sailboard that protects the fin, fin holder and board structure around the fin holder from damage if the fin strikes an underwater object. The attachment includes a flexible slide member which deforms, permitting release of the fle

An attachment of a fin to an adjustable fin holder of a surfboard or sailboard that protects the fin, fin holder and board structure around the fin holder from damage if the fin strikes an underwater object. The attachment includes a flexible slide member which deforms, permitting release of the flexible member from grooves in a slot in the bottom of the board.

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An adjustable fin holder for securing a fin in a slot in the bottom of a sailboard or surfboard comprising: (a) a flexible means for clamping said fin to said board, a pair of grooves in said slot, said flexible means being retained in said grooves, said flexible means being no stronger than necessa

An adjustable fin holder for securing a fin in a slot in the bottom of a sailboard or surfboard comprising: (a) a flexible means for clamping said fin to said board, a pair of grooves in said slot, said flexible means being retained in said grooves, said flexible means being no stronger than necessary to sustain the ordinary loads to which it is subjected; and (b) all parts of said fin and said board being somewhat stronger than necessary to sustain ordinary loads, so that overloads resulting from an aftward blow to said fin will deform said flexible means, and leave said fin and said board undamaged, and permit the release of said flexible means from the grooves.