From the manufacturer

The Navis freebird specific Pilus skins feature a hooking system with a notch in the tip and near the tail. This device reduces length of the skins by approximately 20 cm, resulting in a weight reduction of more than 10%. Externally, they are more intuitive and can be hooked on quickly and securely. Intrinsically, they are composed of a thin, lightweight, highly resistant, and 100% waterproof membrane. Their hybrid composition (mohair/nylon) offers an excellent grip/glide ratio. Their water-repellent material is fluorine-free, which reduces chemical components without compromising performance. The Pilus is therefore the ideal companion for climbing serenely towards bliss.

Features

• Plush material: Mix of mohair and polyamide. 
• Treatment: Hydrophobic treatment. 
• Materials: PFC-Free. 
• Membrane: Light membrane. 
• Glue: Efficient and durable glue. 
• Tip Fixation: TPU Monobloc piece. 
• Tail Fixation: Blackcrows strap and metal hook.