This swim-specific top has no rubberized material, no polyurethane, and no neoprene. It abides to WTC's recent ruling on swimskins, speedskins, swim apparel...whatever WTC wants to call it. It also abides to USAT requirements for swim tops, and is legal for use in ITU races if you are competing as an age-grouper.
Our tests have shown varied improvements of swim times depending on the individual, over wearing a conventional tri top during the swim.  Of course, as with all our products, we offer a 100% satisfaction guarantee. Test it for yourself. If you do not find it performs to your expectations, you may return it for a complete refund.