Thermo Ball is a revolution in insulation technology. Small, round Prima Loft synthetic fibre clusters mimic down to trap heat

Thermo Ball is a revolution in insulation technology. Small, round Prima Loft synthetic fibre clusters mimic down to trap heat

Thermo Ball is a revolution in insulation technology. Small, round Prima Loft synthetic fibre clusters mimic down to trap heat

Thermo Ball is a revolution in insulation technology. Small, round Prima Loft synthetic fibre clusters mimic down to trap heat

Thermo Ball is a revolution in insulation technology. Small, round Prima Loft synthetic fibre clusters mimic down to trap heat

The North Face has developed the Thermo Ball jacket to provide high levels of warmth even in wet conditions. Unique Prima Loft

The North Face has developed the Thermo Ball jacket to provide high levels of warmth even in wet conditions. Unique Prima Loft

Regardless of changing weather conditions, Thermo Ball insulation can perform. Synthetic fibres mimic down achieving excellent

For fell runners, fast climbers, or simply those who heat up easily, the Thetis zip neck is a great choice. Polartec Power