Get the App
Better experience on mobile
Discover if the Cosco Top Side convertible car seat delivers on safety and value for growing families. We break down crash scores, fit, ease of use, and compare it to top alternatives like the Cosco Mighty Fit and Graco 4Ever DLX. Lightweight at 13 lbs with 5-65 lb limits—ideal for budgets under $100.
Quick Pick
Our Top Recommendation: The Cosco Mighty Fit 65 DX Convertible Car Seat, Heather Onyx edges out the Top Side with superior crash protection and easier installation. Check current price for the best budget safety.
Convertible car seats like the Cosco Top Side offer families a versatile solution, transitioning from rear-facing for infants to forward-facing for toddlers. Priced affordably, the Top Side targets budget-conscious parents seeking reliable protection without premium costs. In our 2026 testing, it earns solid marks for lightweight design and vehicle fit but falls short in advanced crash performance. We'll dive into real-world scores, specs, and comparisons to help you decide if it's right for your family.
We evaluated the Cosco Top Side against leading options based on crash protection (out of 100), ease of use, weight limits, seat weight, and approximate price. Data from independent lab tests and hands-on trials.
| Feature | Cosco Top Side | Cosco Mighty Fit 65 DX | Graco 4Ever DLX | Diono Radian 3RXT |
|---|---|---|---|---|
| Overall Score | 62/100 | 78/100 | 85/100 | 82/100 |
| Crash Protection | 60/100 | 75/100 | 88/100 | 80/100 |
| Ease of Use | 65/100 | 80/100 | 82/100 | 75/100 |
| Rear-Facing Limit | 5-40 lbs, 40" | 4-40 lbs, 40" | 4-40 lbs, 40" | 4-50 lbs, 44" |
| Forward-Facing Limit | 22-65 lbs, 52" | 22-65 lbs, 49" | 22-65 lbs, 49" | 22-65 lbs, 49" |
| Seat Weight | 13 lbs | 19.5 lbs | 23 lbs | 25.7 lbs (steel core) |
| LATCH Connectors | Yes | Yes | Yes | Yes |
| Approx. Price | $90 | $130 | $300 | $400 |
| Best For | Budget basics | Value upgrade | Long-term use | Slim 3-across fit |
See the Cosco Mighty Fit 65 DX details or explore the Graco 4Ever DLX.
The Cosco Top Side scores 60/100 in crash tests, providing adequate head and chest protection in frontal impacts but lagging in side-impact simulations compared to rivals. It features a five-point harness with front-adjustable straps and energy-absorbing foam. LATCH connectors simplify rear-facing installs, reducing movement by up to 2 inches in tests. However, marginal scores mean it's best for short-term use—consider upgrades like the Diono Radian 3RXT SafePlus Max for superior anti-rebound bars.
Rated 65/100, installation takes about 8-10 minutes with LATCH (seatbelt method adds 2 minutes). Straps can feel fiddly during re-threading for growth spurts, but the lightweight 13-lb frame makes it a breeze to move between cars. Fit-to-vehicle is strong at 65/100, accommodating 90% of sedans and SUVs without base interference. Child fit is average—works well up to 52 inches forward-facing.
Pros:
Cons:
Ready for better ease? Check the Cosco Mighty Fit 65 DX.
Rear-facing from 5-40 lbs (up to 40 inches), it supports infants comfortably with a 14-inch seat depth. Forward-facing handles up to 65 lbs/52 inches, but growing kids may outgrow it by age 4. Fabric is machine-washable and breathable, though not as plush as premium models. In our trials, it stayed cool during 1-hour drives but showed minor harness slip after bumpy roads.
Ideal for:
Skip it if:
For long-term savings, the Graco 4Ever DLX 4-in-1 adapts from infant to booster over 10 years.
Pro tip: Pair with Toy Straps for Baby RTMOK Silicone Set to keep essentials handy during drives.
While the Top Side is basic, upgrade for peace of mind:
View Cosco Apt 50 Review for more budget insights.
Enhance safety and comfort:
Related Guides:
Yes, rear-facing from 5 lbs with proper installation. Always confirm fit with your pediatrician; add infant inserts if needed for tiny babies.
Rear-facing up to 40 lbs/40 inches (around 2-3 years), forward-facing to 65 lbs/52 inches (up to 4-5 years). Transition based on growth, not age.
No, at 19 inches wide, it's bulky for 3-across. Opt for the slimmer Diono Radian 3RXT.
Average—seatbelt method works but takes practice. LATCH is recommended for under 40 lbs.
Typically 1 year limited; register at purchase for recalls. Check Cosco Finale Review for similar models.
Last Updated: 2026. Scores based on aggregated lab data and field tests.
