• This JP tendon boot is with the FIR-tech technology as the lining fabric has ceramic fibres that reflects body heat as Infra Red energy • Supports increased blood circulation and activation of cells • Shock absorbing hard shell boot that protects against impact. • Soft durable elastic quick release fasteners. • Thermoregulating Graphene lining • Shell: 100% PVC Lining: 100% Polyester 3D mesh with FIR-Tech.