BLUESEVENTY Nero TX Men's Color Jammer BLUESEVENTY Nero TX Men's Color Jammer Blueseventy's NeroTX range incorporates the very latest in modern textile fabric technology. With advanced ultrasonic welding and extensively tested patterns offering the optimal blend of fit, compression and performance, you know you'll soon be swimming faster with Blueseventy. Featuring a warp filament treated nylon, the new NeroTX jammer sits in a class of its own. Ultra low drag co-efficient, compression and dynamic fit offering superior fit and pool performance. We have created a jammer that delivers the maximum performance possible within the FINA regulations.