Nuna
Nuna PIPA rx Infant Car Seat
$550Cheaper
Best Car Seats · head-to-head
Nuna PIPA rx Infant Car Seat vs Clek Foonf Slim Convertible Car Seat
A sourced, side-by-side comparison. Nuna PIPA rx Infant Car Seat is cheaper at $550. Every spec and price links to its source.
Clek
Clek Foonf Slim Convertible Car Seat
$559.99
Released 2012
Which is better: the Nuna PIPA rx Infant Car Seat or Clek Foonf Slim Convertible Car Seat?
The Nuna PIPA rx Infant Car Seat wins 2 of the 2 specs we compare head to head; the other wins 0. The Nuna PIPA rx Infant Car Seat is the cheaper at $550. The Nuna PIPA rx Infant Car Seat both leads on specs and costs less — the straightforward pick.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Nuna PIPA rx Infant Car Seat | Clek Foonf Slim Convertible Car Seat |
|---|---|---|
| US price | $550 | $559.99 MSRP per clekinc.com product page |
| Brand | Nuna | Clek |
| Released | — | 2012 |
| Type | infant | convertible |
| Min weight (lb) | 4 | 14 |
| Max weight (lb) | 30 | 65 |
| Height limit (in) | 30 in | 49 in (FF); 43 in (RF) |
| Install | both | both |
| Steel frame | Yes | Yes |
| Expiration years | 7 | 9 |
| Release | — | 2012 |
Sources — Nuna PIPA rx Infant Car Seat: nunababy.com (verified 2026-06-19). Clek Foonf Slim Convertible Car Seat: clekinc.com (verified 2026-06-19).
What's the difference between the Nuna PIPA rx Infant Car Seat and Clek Foonf Slim Convertible Car Seat?
Where the two actually differ on the specs we track (5 of 7). Matching specs are omitted.
- Type: Nuna PIPA rx Infant Car Seat infant vs Clek Foonf Slim Convertible Car Seat convertible
- Min weight (lb): Nuna PIPA rx Infant Car Seat 4 vs Clek Foonf Slim Convertible Car Seat 14
- Max weight (lb): Nuna PIPA rx Infant Car Seat 30 vs Clek Foonf Slim Convertible Car Seat 65
- Height limit (in): Nuna PIPA rx Infant Car Seat 30 in vs Clek Foonf Slim Convertible Car Seat 49 in (FF); 43 in (RF)
- Expiration years: Nuna PIPA rx Infant Car Seat 7 vs Clek Foonf Slim Convertible Car Seat 9
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Nuna PIPA rx Infant Car Seat
Only one whitelisted tester (Wirecutter/NYT) covers the exact Pipa rx, and only within its competition roundup rather than as a standalone hands-on pick. It praises the well-designed Relx base that ships with the rx and calls the Nuna line lightweight, stylish, and easy to use, but concludes that at close to $400 the Uppababy Aria (its upgrade pick) is a far better choice. No crash-test or other measurements are reported for the rx. (1 sourced review.)
Praised: The Relx base that ships with the rx is better designed and holds the seat securely in place; Lightweight, stylish, and easy to use.
Flagged: Expensive (near $400); Wirecutter says the Uppababy Aria is a far better choice at that price; Only the Relx-base rx models are worth considering; the cheaper Pipa-series base has a design flaw.
Clek Foonf Slim Convertible Car Seat
Only one whitelisted tester, the Good Housekeeping Institute, covers this Clek Foonf, and its notes are hands-on-qualitative (a lab staffer's long-term family use) rather than lab-measured. GHI names it Best Premium, praising tank-like steel-and-magnesium durability and a narrow build that can line up three-across, while flagging its 38-lb heft, rethread harness, and long-ride comfort. (1 sourced review.)
Praised: Tank-like steel-and-magnesium durability; one GH lab tester's child still used it at age 5; Narrow build fits many sedans and can line up three Foonfs across; Extended rear-facing to 50 lbs plus a car-seat recycling program.
Flagged: Heaviest seat on GH's list (38 lb, per spec); Rethread harness requires manual adjustment as the child grows; A GH tester's child found it uncomfortable on long car rides.