Nuna - Aace Booster Seat - Lake

The Nuna Aace Booster Seat in Lake is the last booster seat your child will ever need — growing from high back booster through no-back booster mode with a 3D Growth™ system designed to adapt at every stage. From cute preschooler to independent pre-teen, every element from fabric to foam is smartly sourced to be flame resistant with no added fire retardant chemicals.

3D Growth™ — Engineered to Grow With Your Child

The 3D Growth™ system works in three dimensions simultaneously. A one-hand 9-position height-adjustable headrest grows up with your child, while the shoulder system expands outward in sync with every headrest adjustment. Three seat depths give growing legs plenty of support and space at every stage — no manual reconfiguration required.

Security & Side Impact Protection

Energy-absorbing foam and SIP pods deliver advanced side impact protection, while a belt positioner aids correct shoulder belt routing and minimizes user error. Colored belt path indicators further reduce installation risk, and lower anchor connectors secure the seat to the vehicle during use or transport — adding an extra layer of confidence at every buckle-in.

Comfort From Preschool to Pre-Teen

Eight recline positions in high back mode keep every ride comfortable as your child grows, while ventilation panels within the shell maintain a comfortable climate year-round. Breathable, machine-washable knit fabric and built-in armrests round out a seat designed for the long haul. The sleek micro-knit fabric removes easily for machine washing, and a removable, dishwasher-safe cup holder keeps drinks within reach.

2-in-1 Design & What’s Included

The Aace converts from high back booster to no-back booster as your child grows — high back mode fits 40–110 lbs, 38–60", ages 4+; no-back mode fits 50–120 lbs, 38–60", ages 5+. Dimensions: 22.5"H × 12"W × 14.5"L; weight 15.6 lbs. Every Aace includes the starter kit: cup holder, belt-positioning clip, and set of LATCH guides.

Car Seat Installation at Posh Baby

Every Aace purchased at Posh Baby includes a complimentary car seat safety installation and safety check by our trained staff — because confidence at installation is just as important as the seat itself.

Pair your Aace with a compatible Nuna stroller or browse our full range of car seat accessories at Posh Baby.

Posh Baby is a family-owned Portland boutique specializing in premium baby gear since 2006. Enjoy Tax-Free shopping in most states.