Research-based review
Short version: the 990 isn't marketed as a "flat feet shoe," but its unusually wide width range and stable platform make it a genuinely useful everyday sneaker for wider, flatter feet.
New Balance doesn't market the 990 series as orthopedic or corrective footwear. It's a "Made in USA" premium lifestyle sneaker line, built on New Balance's ENCAP midsole technology — a firm polyurethane rim wrapped around a softer EVA core. The reason it keeps coming up for flat feet has less to do with any built-in correction and more to do with two practical facts: the platform is wide and stable, and New Balance sells it in one of the broadest width ranges available in mainstream footwear.
For flat feet, a wider forefoot is common, and finding an everyday sneaker that doesn't feel cramped across the ball of the foot is a real, recurring problem. The 990 series is sold in narrow, standard, wide, and extra-wide options in most releases — a range most competing lifestyle sneakers simply don't offer. That alone is why it shows up on so many "best for wide, flat feet" lists.
The dual-density midsole construction gives the 990 a firm, planted feel underfoot, which reduces the side-to-side "rocking" sensation some flat-footed wearers notice in softer, less structured sneakers. It won't replace a dedicated stability running shoe like the Adrenaline GTS or Gel-Kayano for training, but for standing, errands, and daily wear, that stability translates into genuine all-day comfort.
Anyone with flat, wider feet who wants a stable, comfortable everyday sneaker and struggles to find width options elsewhere.
You need a dedicated running or training shoe — see our running shoe guide instead.
The 990 series isn't a specialized flat-feet shoe, and it doesn't claim to be. Its value is in solving a specific, common problem — finding a genuinely wide, stable, everyday sneaker — better than most alternatives on the market.
It's marketed and best used as an everyday lifestyle sneaker. It has a stable, cushioned platform, but it isn't built or marketed as a dedicated performance running shoe.
New Balance offers the 990 in one of the widest width ranges of any mainstream sneaker line, from narrow through extra-wide, which is a major reason it comes up often for flat, wider feet.
I'm 32, based in Yerevan, Armenia, and I have grade 2 flat feet myself. This review is based on manufacturer specifications and aggregated, verified buyer feedback rather than personal wear-testing of this specific shoe. Read more about my approach, or see my medical disclaimer.
