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DUO 2 or DUO 3: go by Alpina's size range
Alpina splits its DUO junior line by foot size, not by age. The DUO 2 covers Mondo 14.5–21.5 (145–215 mm) and the DUO 3 covers Mondo 22.0–27.5 (220–275 mm). Both come in black, and both have a white Girl version with the same features. Check the size chart on the product page (Find my boot size); between two sizes, try both.
What each boot does
Alpina pitches the DUO 2 as a beginner's boot with a soft flex and a relaxed fit; it says the relaxed fit helps the boot breathe and the lining is designed to stop feet sweating. The DUO 3 is a softer boot for young skiers, beginners included, that can still handle a bit of speed now and then. It has an anatomically shaped shell for a secure, comfortable hold, and Alpina describes it as very light. Alpina lists GripWalk on the DUO 3 as an option, not as standard.
Getting them on, and fitting
Both boots use Alpina's Easy Entry System: the entry system and the shape of the instep are designed so kids can put the boots on and take them off quickly. Same-day pickup is only at the store that has the item in stock; each product page shows which store has your size today. More boots: ski boots.