New backrest for spearfishing for perfect weight distribution. Anatomical shape for a better fit. Specific and practical pockets with holes for the housing of the weights. Possibility to vary the trim with standard weights of 500 gr and 1 kg, and up to a maximum of 4 kg. Adjustable elastic shoulder straps with quick release buckles in case of need, for greater safety and immediate donning. Elastic line for belt fastening for greater stability, with quick release system. Spearfishing will be easier, safer and more fun. The key features of this ballast backrest are:Anatomic modular backrest (backpack)pockets with holes for standard 500g or 1 kg weights, maximum 4 kgelastic cord for belt attachmentquick release system