Sisu OLX is a built for high speed in tough terrain. The traditional lacing system has been replaced by the BOA® Fit System, guaranteeing a perfect fit and speeding up the process of taking the shoe on and off. The BOA® Fit System also improves the midfoot hold and support which in turn result in an improved running economy. The upper material is a bluesign® high abrasion recycled PET Polyester with a protective TPU mudguard, very smooth and with a thin and direct feeling. Sisu has a low drop (4mm), low sole profile and excellent ground control, ideal for technical trails and off trail-running. OLX is an Icebug technology with fixed studs, delivering the best possible traction on all surfaces nture has to offer. Upper: 100 % recycled PET Polyester with GRS and bluesign® certification. Protective TPU mudguard. Lining: Half lined with bluesign® solution dyed 100 % recycled GRS certified PET Polyester. Lacing: The BOA® Fit System with overlapping panel configuration. Insock: Removable BLOOM® foam EVA, lined with bluesign®, solution dyed textile made from 100 % recycled GRS certified PET Polyester textile. Midsole: Lightweight EVA with 20 % BLOOM® foam. RockShield. Outsole: Rubber with 14 OLX carbide steel tip studs. Weight: 308 gr (US 10) /254 gr (USL 7,5). Size: US 7–13 (40 – 47) / USL 5,5 – USL 10,5 (36 – 42). Torsion: Easy Flex. Drop: 4 mm. Cushioning: Responsive. Last: Narrow racing fit with straight big toe line.