Jelly slides in a heatwave: where they rub

Jelly slides keep coming back because they solve a real problem. They are waterproof, they rinse clean under a tap, and they cost little enough that ruining a pair on wet pavement is not a disaster. Then the temperature climbs and the compromise shows up.

Molded plastic does not breathe. On a hot day the footbed warms to skin temperature and stays there, and any moisture between foot and plastic has nowhere to go. What follows is not a comfort problem so much as a friction problem: a damp foot slides a little inside a strap that is not designed to give.

The rub points

The usual sore spot is the top edge of the strap where it crosses the instep, and on a wide-strap slide it appears as a faint red line rather than a blister. On a thinner two-strap design the pressure concentrates instead at the outside of the little toe.

A textured footbed helps more than a smooth one, because the ridges break up the sliding surface. A slightly cupped heel helps too. A dead-flat glossy footbed is the version that turns a long walking day into a shuffling one.

What they are good at

Short distances, wet ground, anywhere you would otherwise be barefoot on something unpleasant. A market run, a poolside, a rainy walk to a car. In that use they are hard to beat and nothing else in the wardrobe does the job.

What they are not is a walking shoe. There is no arch support in a molded slide, and by the second hour that absence is the loudest thing about them.

Buying notes

Go up if you are between sizes. Plastic does not stretch, and a jelly slide that is a whisker tight when cool becomes tight everywhere once your foot swells in the heat. Check the sole for a tread pattern rather than a flat plane, because a smooth jelly sole on a wet tiled floor is genuinely slippery.

Color is worth a thought. Translucent pastels look expensive in a product shot and show every speck of grit in real life. An opaque pair stays looking new for longer, which for a cheap shoe is most of the value.

Verdict

Buy them for what they are: a specific, cheap, waterproof tool that happens to look good. Wear them for an afternoon rather than a day, rinse them out, and do not expect the footbed to forgive you at hour three.

Comfort and sizing notes here describe our own wear tests, and are not professional advice.

Questions people ask

Where do jelly slides usually rub your feet?

In our wear tests, the top edge of a wide strap left a faint red line across the instep. Thinner two-strap designs concentrated pressure near the outside of the little toe.

Are jelly slides comfortable for walking all day?

They worked best for short distances, wet ground and quick trips. After a couple of hours, the lack of arch support and the warm, damp footbed made them uncomfortable.

Should you size up in jelly slides?

We found it better to go up when between sizes because plastic does not stretch. A close fit when cool can feel tighter once the foot swells in hot weather.