Britax Willow S Review

Best For Multiple Cars

Overall72

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Britax Willow S

Safety notice: Britax recalled 144,000+ other seats in 2026 over a carrying-handle screw, B-Safe Gen2, Flexfit, B-Safe 35, B-Safe Ultra and Endeavors. The Willow S is not on that list. Check your model and serial on Britax's recall page.

Crash test8/10

Ease of install (LATCH)7/10

Ease of install (belt)8/10

Ease of install (no base)8/10

Ease of use6/10

Comfort & durability6/10

Weight7/10

Pros

• ClickTight door clamps the vehicle belt for you, and belt install scored 8
• SafeWash fabric machine washes and dries without losing its flame resistance
• European belt routing for baseless taxi and rental use
• Solid structural numbers for a mid-price seat

Cons

• Manual rethread harness, where a no-rethread would be fair to expect in this tier.
• The carry handle has mold seams that feel rough in the hand, cosmetic, but noticeable on a long carry.
• The infant insert foam flattens quickly. Use only Britax's own parts here: an aftermarket insert is not crash-tested with the seat.

Our Verdict: Britax Willow S

The Britax Willow S scored 72 out of 100 across the seven criteria we score every infant car seat on, and took Best For Multiple Cars in our infant car seat guide.

The belt install is why it ranks. The ClickTight door clamps the vehicle belt for you, so belt and baseless installs both scored 8.

A manual rethread harness is a miss at this tier, the carry handle has rough mold seams, and the insert foam flattens quickly.

Our Analysis, Comparisons and Test Results

Crash test

Eight. Solid structural numbers, helped by a base that holds the belt genuinely tight rather than relying on the fitter.

Ease of install (LATCH)

Seven. Competent rather than remarkable. This seat's install story is about the belt, not the anchors.

Ease of install (belt)

Eight, and the reason to buy it. The ClickTight door clamps the vehicle belt mechanically, so a correct install needs no body weight and no technique. If this seat moves between cars, that is worth more than any other number here.

Ease of install (no base)

Eight. Consistent with its ClickTight story: this is a seat designed to move between vehicles, and it behaves that way without the base too.

Ease of use

Six. SafeWash fabric machine washes and tumble dries without losing flame resistance, which is rarer than it sounds. Held back by a manual rethread harness at a price where a no-rethread would be fair to expect.

Comfort & durability

Six. The fabrics survive washing well. The carry handle has mold seams you can feel on a long carry, and the infant insert foam flattens early.

Weight

Seven. Middling, and unremarkable either way.

Should You Buy the Britax Willow S?

Buy it if the seat moves between cars or your car lacks easy lower anchors.

Stick to Britax's own inserts, because an aftermarket one isn't crash-tested with the seat. Its score comes from owner reviews and published specs.

Scored against the same seven criteria as everything else here, this is a question of fit rather than quality. The gear that gets used is the gear that suits your week.

What Other Car Seats Should You Consider?

We scored the Britax Willow S against 12 other infant car seats on the same criteria. The three closest on score:

Specifications

Conclusion: Britax Willow S

The Willow S took the multiple-cars award with 72. Ease of use and comfort at 6 are its lowest marks.

The whole lineup, scored on the same criteria, is in our infant car seat guide.

Tested against 14 other car seats in Best Infant Car Seat 2026: 15 Seats Compared. See all car seats guides and reviews.