10 Best Britax Convertible Car Seat of December 2025

• 10 years of use: New one4life convertible to booster car seat grows with your child from 5 to 120 pounds & up to 63 inch tall
• Install confidently: With a ClickTight installation, you'll know it's right in 3 easy steps
• One4life: Converts from rear facing infant car seat, to forward facing 5 point harness, to high back belt positioning booster
• Britax safety: High strength steel frame, crumple zone helps absorb crash energy and patented v-shaped tether
• Full body protection: 2 layers of side impact protection surround the head, neck & torso

BRITAX

• Use the Marathon ClickTight Convertible Cover Set as a backup or to refresh an older car seat
• Cover Set includes seat cover, headrest cover, EZ-Buckle belly pad, and two comfort pads
• Compatible with only Britax Marathon ClickTight Convertible Car Seats, excludes non-ClickTight seats
• Dimensions 22.5” L x 5.5” H x 18” W
• Please refer the user guide for vehicle compatibility and trouble shooting steps.

BRITAX

• Use the Advocate ClickTight Convertible Cover Set as a backup or to refresh an older car seat
• Cover Set includes seat cover, headrest cover, EZ-Buckle belly pad, and two comfort pads
• Compatible with only Britax Advocate ClickTight Convertible Car Seats, excludes non-ClickTight seats
• Dimensions 22.75” L x 5.5” H x 21.5” W

BRITAX

• Use the Boulevard ClickTight Convertible Cover Set as a backup or to refresh an older car seat
• Cover Set includes seat cover, headrest cover, EZ-Buckle belly pad, and two comfort pads
• Compatible with only Britax Boulevard ClickTight Convertible Car Seats, excludes non-ClickTight seats
• Dimensions 22.75” L x 5.5” H x 21.5” W
• Shoulder pads

BRITAX

• Easy installation: Push button Latch connectors and built in lock offs make car seat installation a breeze
• No rethreading, ever: Quick adjust 10 position harness (8.5 to 17.5 inches) with headrest grows along with your child
• Easy clean up: Remove the car seat cover without removing the harness
• Designed for safety: 2 Layers of side impact protection, steel frame, impact absorbing base, and forward movement reducing v shaped tether
• Fits: Rear facing 5 to 40 pounds and forward facing 20 to 65 pounds; Dimensions: 26 inch H x 18.5 inch W x 21 inch D; Shoulder Width: 13 inches

BRITAX

• Trusted quality, upgraded design: Looking for frontier? Grow with you ClickTight is our newest harness to booster car seat
• Install confidently: With a ClickTight, you know it’s right in just 3 easy steps. Open, thread & buckle, close.Shoulder width:12 inch
• 2 in 1 booster seat: Easily transitions from forward facing harness mode to belt positioning booster mode as your child grows from toddler to big kid
• Cool flow mesh fabric: Improves air flow to keep your child cool and comfortable
• More comfort: Stay put, soft comfort pads keep your child's neck from rubbing against the harness strap

BRITAX

• Easy installation: Push button latch connectors and built in lock offs make car seat installation a breeze
• No rethreading, ever: Quick adjust 10 position harness (8.5 to 17.5 inches) with headrest grows along with your child
• Easy clean up: Remove the car seat cover without removing the harness
• Designed for safety: Side impact protection, steel frame, impact absorbing base, and forward movement reducing v-shaped tether
• Fits: Rear facing 5 to 40 pounds and forward facing 20 to 65 pounds; dimensions: 26 x 18.5 x 21 inches (HxWxD)

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• Easy installation: Push button Latch connectors and built in lock offs make car seat installation a breeze
• No rethreading, ever: Quick adjust 10 position harness (8.5 to 17.5 inches) with headrest grows along with your child
• Easy clean up: Remove the car seat cover without removing the harness.Shoulder width:13 inch
• Designed for safety: 2 Layers of side impact protection, steel frame, impact absorbing base, and forward movement reducing v-shaped tether
• Fits: Rea facing 5 to 40 pounds and forward facing 20 to 65 pounds; Dimensions: 26 H x 18.5 W x 21 D inches; Shoulder Width: 13 inches

BRITAX

• Easy installation: Patented click tight makes car seat installation as simple as buckling a seat belt
• No rethreading, ever: Quick adjust 14 position harness with click and safe, snug indicator gives a click sound when the harness is tight
• Adjust accurately: Harness indicator gives an audible click when you’ve pulled to the proper tightness. Shoulder Width:16 inch
• Surrounded in safety: 2 layers of side impact protection, steel frame and impact absorbing base
• Fits: Rear facing 5 to 40 pounds and forward facing 20 to 65 pounds; dimensions: 23 x 18.5 x 23.5 inches (LxWxH)
• Buckle strap depths: 5.25"/7"

BRITAX

• Easy installation: Patented ClickTight makes car seat installation as simple as buckling a seat belt
• Surrounded in safety: 3 layers of side impact protection, quick adjust head protection, steel frame and impact absorbing base
• Anti Rebound Bar: Padded, steel bar minimizes crash forces by stabilizing the car seat when installed rear facing
• No rethreading, ever: Quick adjust 14 position harness with Click & Safe Snug Indicator gives a click sound when the harness is tight
• Fits: Rear facing 5 40 pounds, forward facing 20 65 pounds; Dimensions: 23 L x 20.5 W x 23.5 H inches
• Buckle strap depths: 5.25" / 7"

BRITAX