Inside the collar there is a polypropylene strap with a class 1 OekoTex certificate that has been tensile strength tested
- The 2.5 cm wide straps breaking point is 274 kg
- The 4 cm wide straps breaking point is 528 kg
The D-ring (black coated / nickel plated steel) is also tensile tested
- The breaking point of 2.5 cm wide is 200 kg
- The breaking point of 4 cm wide is 300 kg
The buckle is black coated / nickel plated steel and is tensile tested to 200 kg
The surface fabric is cotton or a cotton blend. The exact composition of the fabric is not always known, as we use surplus from the textile industry and fabric retailers.