Bluegrass tuatara back and shoulders d3o d30 technology allows us to make protectors which provide a maximum level of safety and the best level of comfort and freedom to move the tuatara features d30 inserts on the back and in the shoulders along with high density eva for additional protection on the torso featureslight and removable d30 core with parallel grooves which help to follow the bodys movementsd30 shoulder guards integrated shoulder guards non removablehigh density eva torso inser