assistant: Black toenails point to a shoe that's either too tight in the toe box or has inadequate cushioning in the forefoot — or both. Combined with wide feet, you need a daily trainer that gives you real room up front and doesn't compress the toes during impact. From what I have, **New Balance 880 v15** is your best fit. It has a genuinely wide forefoot and comes in a wide option. The catch: Doctors of Running notes it's "low volume" despite the width, so it sits snug on the foot overall — but the toe box itself is roomy. The Fresh Foam X midsole is firm and structured, which some runners find less plush, but that stiffness also means less compression of the forefoot during landing. Run Moore confirms it's much better on volume than earlier 880s and fits true to size (maybe an eighth short), so you shouldn't need to size up. **Mount to Coast C1 v1** is a strong alternative if you want more cushioning and energy return. It's lighter (261g vs 281g), has a taller stack (42/36mm vs 38/32mm), and explicitly runs wide in the forefoot. It's rated for long runs and daily training, so it's versatile. At $180, it's above the 880 but still reasonable. **New Balance 1080 v15** is the third option — excellent shoe, high energy return, 500+ mile durability — but it runs standard width in the forefoot, so it may not solve your toe-box problem despite being a great trainer otherwise. One clarifying question: when you say you've been getting black toenails, is it mainly on one toe (usually the second), or multiple toes? That might tell us whether it's a length issue (shoe too long, foot sliding forward) versus pure width constraint.