SCARPA North America is recalling about 2,100 pairs of F1 EVO Ski Boots in the United States and 250 in Canada because their Tronic component can unexpectedly switch from ski mode to walk mode, not allowing the boot to release from the binding, posing a fall or injury hazard.

The Tronic system locks the boot into the ski binding. SCARPA has received two reports of torn knee ligament injuries following falls, when the boots failed to release from the binding.

The boots were sold in royal blue for men and aqua blue for women with “SCARPA” written in white letters on the lower outer side of the boot as shown at right. The model name “F1 EVO” is printed on the upper right outside ankle cuff of the boots.

SCARPA is instructing consumers to immediately stop using the boots and contact SCARPA North America for a full refund.

The boots, which were made in Italy by Calzaturificio S.C.A.R.P.A.  S.P.A., were sold by authorized SCARPA dealers and retailers in the United States and Canada, including Oregon Mountain Community, REI and Skimo Co., and online at www.scarpa.com from October 2014 through January 2015 for about $700.