https://fromrebel.com/products/tranzitions-3-in-1-harness-booster-car-seat-proof-b8e18a 14867137364335 Tranzitions 3-in-1 Harness Booster Car Seat - Proof 115.99 https:files/0f207fbf-1697-43a7-9100-644c2a87ae47_0d3c5c22-cb9e-464b-b67c-b4224caf8b2b.webp https:files/0f207fbf-1697-43a7-9100-644c2a87ae47_0d3c5c22-cb9e-464b-b67c-b4224caf8b2b.webp USD InStock Graco 635314471279 Baby 639935873391 Baby & Kids 641800995183 Baby Best Sellers 630363128175 Best Sellers 291289268373 Big Babies 6-18 months 306878283925 Car Seat + Boosters 291287662741 Car Seats 636240265583 Daily Deal Drops 291285696661 Gifts Under $100 302408237205 Gifts Under $150 302408269973 Gifts Under $350 312721539221 Graco 646287884655 Newness 644789829999 Non-DS 291282223253 Over $10 635358577007 Over $75 Warranty Products 291288187029 Ships Nationally 291285368981 Shop All 306996609173 Shop By Age 640501580143 Up to 30% OFF 291286712469 What's New 636239970671 What's New in Baby Gear & Kids The Graco® Tranzitions™ 3-in-1 Harness Booster is designed to grow with your child and go with you, wherever your journeys take you—from car to carpool and beyond. This lightweight car seat transitions seamlessly from harness booster (26.5-65 lb) to highback booster (40-100 lb) to backless booster (40-100 lb) and features the Simply Safe Adjust™ Harness System, which adjusts your harness and headrest to 9 height positions, with no rethreading. Two rotating cup holders to keep your child happy Machine washable seat pad Harness covers for extra comfort 3-in-1 harness booster helps protect your child, from toddler to youth, with a lightweight, portable design ideal for busy, active parents. 139.99 Graco ADDONPOP AutoList_v4 AutoPublish_v1 BABY BOOSTER SEATS CAR SEATS FRESHNESS FY2026.49 GRACO NEW ARRIVALS PERCENT_OFF_RANGE_0_20 PERCENT_OFF_RANGE_0_30 REBELBEST https:files/387a1293-9153-4790-923e-95546ce59c55_7e5d4304-bd18-475c-8bb9-3ca69d1b8160.webp https:files/61d3b90d-b5af-44b5-8b83-0f7bccac0be1_0cc5d770-a81d-4974-ab52-01f7a76ae2da.webp https:files/985a995e-78d3-4081-abd2-39794bd7d511_0e4d5c15-eaf3-4a33-b026-752cef5854e2.webp https:files/c723eb3f-e80b-4291-b184-4c71a3ab1b3c.webp https:files/f80ba2c1-263c-4e4f-8a5c-42bd90b18470_e79a758c-71ab-497d-97e7-6206bd8d9fc3.webp https:files/950609bc-357d-4069-b1b0-72faa37f096d_8e73ed9f-e211-4a0a-b8c5-2c88e8e1b594.webp https:files/b208fc29-0d24-4820-8159-3cf4d9b3a053_582247b8-5ac2-4e22-93df-52d751f096ea.webp https:files/cff95311-342b-4269-bcac-52b277a26ab6_3d9529dd-c9c1-46cb-aab7-35db2d7dc64b.webp https:files/69403cae-c6ab-4d08-aeff-ac6d497d2081_1f2882ef-5eb6-431e-aa33-c390cadb4202.webp https:files/c723eb3f-e80b-4291-b184-4c71a3ab1b3c_a86afd41-a14e-4303-af22-f13b7001d687.webp https:files/7b29cfec-dee3-4b42-9c18-29b3e9200bf8_6b96b218-f584-4e57-9c11-ce18af0d1db9.webp 52563005309295 Open Box 115.99 139.99 https: https://fromrebel.com/products/tranzitions-3-in-1-harness-booster-car-seat-proof-b8e18a?variant=52563005309295 InStock Open Box 52563011207535 Imperfect 84.99 139.99 https: https://fromrebel.com/products/tranzitions-3-in-1-harness-booster-car-seat-proof-b8e18a?variant=52563011207535 InStock Imperfect