Specifications DUO CODE > MODEL > SIZE > SKIER TYPE FLEX LAST WEIGHT LINER / SHELL / CUFF TECHNOLOGIES 3K431 DUO 1 GIRL 150-220 RECREATIONAL SOFT- 750G DUO-FIT, ZOOM, ZOOM- 3F641 DUO 4 220-275 RECREATIONAL SOFT- 1600G DUO-FIT, DUO CUFF, DUO SHELL MADE IN EUROPE 3F651 DUO 3 220-275 RECREATIONAL SOFT- 1600G DUO-FIT, DUO CUFF, DUO SHELL MADE IN EUROPE DUO CODE > MODEL > SIZE > SKIER TYPE FLEX LAST WEIGHT LINER / SHELL / CUFF TECHNOLOGIES 3K381 DUO 2 145-215 RECREATIONAL SOFT- 800G DUO-FIT, DUO CUFF, DUO SHELL MADE IN EUROPE 3K391 DUO 1 150-220 RECREATIONAL SOFT- 750G DUO-FIT, ZOOM, ZOOM- 110