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Does the Britax Willow S fit the BOB Alterrain Pro?

Yes, with an adapter

Yes, with one adapter: the BOB Jogging stroller adapter for Britax ClickTight seats.

What you need

Britax Willow S (illustration)
Illustration
Car seatBritax Willow S$279.99 list priceCheck price
Jogging stroller adapter for Britax ClickTight seats (illustration)
Illustration
AdapterBOB Jogging stroller adapter for Britax ClickTight seatsabout $94.99Get this adapter
BOB Alterrain Pro (illustration)
Illustration
StrollerBOB Alterrain Pro$829.99 list priceCheck price

This answer is for the BOB Alterrain Pro.

Key specs

Adapter
about $94.99
Whole set, list prices
$1204.97
Weight with carrier
41.5 lb
Seat rated to
30 lb, 32 in
Stroller folded
39.3 x 25.5 x 16 in (L x W x H, wheels on)
Walking, not jogging, with a car seat on (illustration)

Good to know before you click it on

  • The 2 removable receivers are needed only on Alterrain / Alterrain Pro.
  • Never jog with an infant car seat attached; the store page lists 'From Birth with Infant Car Seat (walk only)'.

About this pair

The Britax Willow S goes on the BOB Alterrain Pro with the BOB Jogging stroller adapter for Britax ClickTight seats (model S943900), about $94.99. With the carrier on, you are pushing about 41.5 lb (32.3 lb stroller, 9.2 lb carrier). The seat itself is rated up to 30 lb and up to 32 in, per Britax.

Read more ↓

14 other infant seats fit the BOB Alterrain Pro.

Summary from the makers' published data.

How to set up the Britax Willow S on the BOB Alterrain Pro

Walking, not jogging, with a car seat on (illustration)

What you need

  • The BOB Alterrain Pro
  • The Britax Willow S carrier (its car base stays in the car)
  • The BOB Jogging stroller adapter for Britax ClickTight seats (model S943900)

Step by step

  1. Set the parking brake and rotate the canopy toward the handlebar.
  2. If the stroller has no built-in receivers, push the included R and L receivers onto the yellow pins behind the seat fabric until they click and green bars show.
  3. Push both end caps of the adapter straight into the receiver sockets until each side clicks, then pull the front tube to check it is locked.
  4. Recline the stroller seat and set the car seat on the adapter rear-facing and centered, lining up the car seat's side hooks with the receivers.
  5. Push the car seat straight down until both sides click.
  6. Lift up on each side of the car seat to check it is secure.

Retold from BOB manual (PDF).

Don't

  • Do not run or jog with the car seat on the adapter.
  • Do not use it off-road or on uneven ground with the car seat attached.
  • Take the adapter off before folding the stroller.
  • Take the adapter off before seating a child directly in the stroller seat.
  • If your stroller has built-in receivers, do not use the removable receivers from the box.
  • Not compatible with Britax B-Safe car seats.
  • Take the adapter off when you are not using it.
Checking the car seat is locked in (illustration)

Last check: give the carrier handle a gentle tug. A seat that is fully latched does not lift off.

Fold and use the Alterrain Pro →

Checking a question on a phone next to a stroller (illustration)

Questions about this pair (5)

Does the Britax Willow S fit the BOB Alterrain Pro?

Yes, with one adapter: the BOB Jogging stroller adapter for Britax ClickTight seats.

BOB adapter page

Which adapter do I need for the Britax Willow S on the BOB Alterrain Pro?

BOB Jogging stroller adapter for Britax ClickTight seats (about $94.99).

Adapter details

How heavy are they together?

41.5 lb: the Alterrain Pro weighs 32.3 lb and the Willow S carrier 9.2 lb.

How much does the whole set cost?

About $1,204.97 at the makers' list prices, including the $94.99 adapter. Stores and sales vary.

Where does this answer come from?

From the makers' own pages: BOB adapter page, Britax manual (PDF).

See the makers' words

Other car seats for the BOB Alterrain Pro

All 14 car seats for the BOB Alterrain Pro →

Other strollers for the Britax Willow S

Pros and cons of this pairing

Why parents pick it

Nothing stands out in the makers' data.

Keep in mind

  • Needs the BOB Jogging stroller adapter for Britax ClickTight seats (about $94.99). (maker)
  • Heavy together: about 41.5 lb (a typical pairing is 34.4 lb). (compared with the strollers and seats we list)
  • No jogging or running with an infant seat attached. (maker)

Manuals and downloads

Straight from the makers. The manual that came with your product is the one to follow.

How we know: the makers' own words

  1. BOB says it needs an adapter (Jogging stroller adapter for Britax ClickTight seats).

    “Model Number: S943900 ... Compatible Infant Car Seats: Champ, Willow, Willow S, Willow SC, Cypress ... Compatible BOB Gear Single Jogging Strollers: Alterrain, Alterrain Pro, Revolution Flex 2016+/2.0/3.0, Rambler”

    BOB adapter page · checked 2026-09-24

  2. Britax says it needs an adapter (Jogging stroller adapter for Britax ClickTight seats).

    “BRITAX WILLOW S ... ALTERRAIN / ALTERRAIN PRO / REVOLUTION Flex 2016+/2.0/3.0 / RAMBLER: USE WITH SINGLE JOGGING STROLLER ADAPTER FOR SELECT BRITAX INFANT CAR SEATS WITH CLICKTIGHT S943900”

    Britax manual (PDF) · checked 2026-09-24

Always check both manuals before the first walk. How we check.