How is the Spider different from other rescue floats? The Spider, while designed to be used in conjunction with a USCG Type IV floatation device, can also be used with anything that has buoyancy. It has proven to be more effective (accuracy) and more efficient (allows for multiple attempts). What other applications are there for the Spider? The Spider is a versatile accessory that can be attached to just about anything! Although designed to be attached to a USCG Type IV throwable, the Spider cou