The Challenge Dune Pro Open Tubular Folding Clincher Tyre has a 300 TPI SuperPoly casing made of polyester and is equipped with a Puncture Protection Strip (PPS), which is an extra layer of highly resistant material between the casing and the tyre to reduce the risk of punctures.

A special sealing protects the tyre against water and increases the durability as well. 
Features

Open Tubulars - Open tubular tyres mount like a standard clincher and are made using the same process as regular tubular tyres, but instead of sewing the casing together, the sides of the tubular casing are folded around aramid fiber cords to produce the beads. The result is a tyre that maintains most of the suppleness and ride quality gained from a tubular to offer excellent traction and cornering grip, low rolling resistance and shock absorption. 

 
Non-vulcanised - Ultimately the major difference between a Handmade Tubular or Open Tubular and the majority of clinchers is that it will avoid the heat and pressure process called vulcanisation, which most tyres undergo in production. It is used to bind the materials, but compromises the ride quality when the rubber gets stiffer. Treads are hand-glued onto Challenge Tubulars and Open Tubulars, and the latex and rubber maintain their ideal quality.
Thread count (TPI) - Thread count plays a major role in the weight, suppleness and durability of Tubulars and Open Tubulars. The higher the number of threads per inch (TPI), the thinner each individual thread, making a thinner and lighter casing and a more supple tyre. Their lower TPI casings are thicker and more durable.
Casings - They offer casings made from silk, cotton or polyester. Silk provides the highest ride quality, with threads so fine they don't measure the thread count, and is stronger than cotton and polyester. Corespun cotton casing is lite and supple, and available up to 320TPI for maximum control and performance. SuperPoly and Poly polyester casings are less expensive and more durable, still providing the qualities of top-end tubulars.
Rubber - Their treads are made from locally-sourced natural rubber in their own factory in Thailand. Not only is natural rubber more supple than synthetic rubber — which accounts for the majority of the world's tyre production — the grip is far superior. 
Puncture Protection Strip (PPS) - An extra layer of uniquely-crafted fabric with highly resistant properties sits between the casing and the tyre to reduce the risk of punctures. Tyres intended for use in intense conditions with a high puncture risk are reinforced with a second PPS layer beneath the casing.
Seamless latex inner tube - Their Seamless Latex Inner Tubes are also produced in their own factory from locally-sourced materials and are either sewn inside their Tubulars or sold individually to be mounted onto an Open Tubular setup. Latex has elastic and absorptive qualities that enable a larger point of contact than a butyl tube. The added elasticity reduces rolling resistance and enhances comfort and speed, making latex an ideal material for racers at the top level of the sport.
Specifications
Use: Cross Racing: Sand, Icy Conditions
Size: 700
Tyre Width: 33mm
Internal Rim Width: 15-19mm
Weight: 355g
TPI: 300
Casing: SuperPoly
Flat protection: PPS
BAR: 2-6
PSI: 30-90
Colour: Black/Tan
NOTE
NOT TO BE USED WITH TUBELESS RIMS OR ENVE WHEELSETS
 
 

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