i-Irvana™ | Installing Your i-Size Harnessed Booster Seat

Watch how easy it is to install your i-Irvana™ harnessed booster seat. This harnessed booster sports 15 headrest positions
and is ready for any growth spurt from 15 months all the way up to approx. 12 years. i-Irvana™ can be used in harness mode from 76 - 105 cm (15 months to approx. 4 years) and in booster from 100 - 150 cm (approx. 3.5 to 12 years).
Learn more about i-Irvana™ at:
Product Size: l 44.9-51 cm x w 44.7 cm x h 59-83 cm
Product Weight: 7.2 kg
Product Usage: 76-150 cm (15 months to approx. 12 years)
Testing Certification: ECE R129/03
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Is it ok if I use both isofix and top tether in the booster mode? Why top tether is not used while in booster mode? Thank you a lot