Britax Willow Guia Del Usuario página 58

Using the Lower Anchors
The Lower Anchors offer an alternative to vehicle seat belt
installation methods. The figure below shows typical locations
for lower anchors in a vehicle. See page 3 for lower anchor
components on this child seat.
Top Tether
Anchors
Vehicle Seat
Belt Retractor
Lap-Shoulder
Vehicle Seat Belt
Check your vehicle owner's manual to learn if it is equipped with
lower anchors, the maximum weight rating and information on the
lower anchor locations and designated seating positions available
for use with this child seat.
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Vehicle Seat
Head Restraint Vehicle Seat
LATCH
Seat Belt Buckles
Lower Anchors
Frontal Air Bag