Okay, so I finally caved and bought these SLEEP ZONE sheets after seeing them everywhere. Verdict? My kiddo won't sleep in anything else now!
The blue cars print is ADORABLE - like seriously, my 5-year-old did a happy dance when he saw them. The microfiber feels crazy soft (way nicer than I expected for the price) and they've survived 3 months of weekly washes without pilling.
Pro tip: The fitted sheet stretches like magic over his bulky mattress topper. Was worried about the depth but no issues at all. Only weird thing? The flat sheet is HUGE - like comically large for a twin bed. We just tuck the excess under.
Bonus points for being OEKO-TEX certified. As a paranoid mom, I appreciate knowing there's no weird chemicals touching my kid's skin all night.
10/10 would buy again (and probably will when he inevitably decides he's 'too old' for car sheets next year).