Replace sneakers when the outsole has lost its grip, the midsole no longer cushions your stride, or the upper has stopped holding your foot securely. A clean-looking pair can still be worn out inside. Walk across a hard floor and notice whether one foot lands flatter than the other. Look at the sole from heel to toe. Smooth patches under the heel or forefoot show that the tread is doing less work, especially if the pattern has worn unevenly.

The low tops here run from $36 to $300, but price is not a replacement schedule. A $36 pair can be the right choice for light use, while a much more expensive pair still needs replacing when the sole is flat or the heel counter collapses. Fold the shoe gently at the ball of the foot. It should flex there, not buckle through the middle. Press the heel collar and check that it springs back rather than staying crushed. Then compare the two shoes. Uneven wear usually tells you more than the calendar does.

The upper, sole and inside of a sneaker fail in different ways. Suede and mesh can look worn before the shoe loses support, so inspect the side panels and the area around the laces for stretching or holes. Leather can hide age more effectively, but deep creases across the toe and a softened heel still change the fit. The Samba MN and SL 72 OG show the mix of suede, leather and mesh that needs checking at more than one surface.

Take the insole out if it allows you to. A permanently compressed footbed can make a shoe feel flat even when the outsole still has tread. Check for dampness or a smell that remains after airing, and do not assume a wash will restore the structure. The suede and mesh group ranges from $45 to $195. Those prices cover several constructions, so the useful comparison is not cheap against expensive. It is a pair with a firm heel, intact flex point and even tread against one that has become soft, twisted or slippery.

Fit is part of wear. If your toes touch the front or your heel lifts with every step, the shoe may have been wrong from the start. A poor fit accelerates creasing and makes a sound pair feel ready for the bin.

Choose the next pair by what the old pair was asked to do. A low top is easy for everyday outfits, but a minimal silhouette will show dirt and creasing more quickly than a textured or paneled one. Suede and mesh can feel lighter and more flexible, while a leather upper gives a cleaner line with trousers or a skirt. The leather group runs from $110 to $330, and the range reflects different shapes and finishing details rather than a guarantee that one pair will last longest.

Keep at least one day between hard wears when you can. Let the shoe dry naturally, loosen the laces before taking it off and use a shoehorn if the heel is firm. Do not leave a pair crushed beneath a bed or in a hot car, because heat and pressure distort the upper and the heel. A soft brush is safer for suede than vigorous rubbing, while a damp cloth is enough for many smooth surfaces.

When replacing a favourite, take the old pair with you or photograph the wear pattern. It shows whether you need more room at the toe, a firmer heel or a different sole shape. The whole edit runs from $36 to $330, so there is no reason to replace a worn pair with the same problem.

We would replace a trainer for what it is doing underfoot, not for a tired colour or a few harmless creases. The first checks are grip, even tread, a heel that still holds its shape and a midsole that has not gone flat. We would buy a low top for general wear, choose suede and mesh when flexibility matters, and look at leather when a cleaner outline is the priority. We would skip any pair that pinches at the toes or lets the heel lift, because a new upper cannot fix the wrong fit.

If you take one thing away: inspect the sole and heel before the upper, because hidden support failure is the real replacement signal.