Are Spectra and Dyneema the same? 

Both fibers are made from Ultra High Molecular Weight Polyethylene, or UHMWPE. 

Dyneema has a slightly different molecular structure than Spectra and a higher breaking strength in the larger diameters. It displays slightly better wear characteristics in heavy use areas, but has more elasticity than Spectra 1000. It has a low specific gravity and therefore floats. Also it is very UV resistant.