Matt polyester cover, Excel Racing with Dyneema ® SK78 core. Applications: Sheets. Benefits: Matt cover provides comfort for the hands under high loads. Matt Cover is easily stripped where the rope isn’t handled. to reduce weight. Colour coordinated Excel Racing inner provides the strength. Excel Racing cover can be further stripped to reveal high strength, light weight Dyneema® core – less weight pulling the spinnaker down. Easy to taper.