A padel sole is cut for one job: holding the foot while it pushes sideways on a surface that is not solid. Most club courts are artificial grass dressed with sand, and that loose top layer is what the tread has to deal with. Three patterns cover almost everything on the market, and this catalogue carries all three.
Herringbone
Rows of angled bars, alternating direction. The gaps between the bars clear sand as the foot loads, so the rubber keeps meeting the surface instead of riding on a layer of grit. It is the pattern most often listed for sand-dressed artificial grass, which is what most clubs lay.
Its weakness is the same as its strength: on a clean, hard surface the bars have nothing to clear and less rubber is in contact than a flatter tread would give.
Omni, also listed as mixed
A tread that combines clay-type and hard-court sections in one sole. The depth sits between the two rather than committing to either. On a sanded court it still bites the loose layer; on a cleaner surface it does not lose grip the way a deep clay tread can.
It is the sensible default for a player who does not know what they will be playing on, or who moves between clubs with different surfaces.
Spike
The most aggressive of the three, cut for loose clay. Deep, widely spaced blocks that dig in rather than clear. On a hard indoor court the same depth means less rubber touching the ground and a vaguer feel underfoot.
Reading the label
Manufacturers publish this under names that do not always match: some state a pattern (herringbone, spike), some state a compound or a supplier instead, and some state only that the sole is for padel. Where this catalogue has the maker's own wording, it is printed on the product page under Outsole or Sole Type, and where the maker publishes nothing, the row is absent rather than guessed.
What it does not tell you
An outsole pattern says what the sole is designed to grip. It says nothing about how the shoe fits, how it holds the foot laterally, or how long the upper lasts. Those are separate questions, and sizing in particular runs differently between makers — the safest comparison is a pair of the same brand already owned.
Indoors, outdoors, and the wrong sole
Indoor courts are usually the same sand-dressed turf under a roof, so the sole question does not change much when the weather does. What changes is how much sand is on the surface: a covered court holds its dressing, while an open one loses it to rain and wind and is re-sanded periodically. A tread that clears sand well is doing more work on a freshly dressed court than on a bare one.
Playing a court with the wrong sole is rarely dramatic. It shows up as a foot that slides a few centimetres further than intended on a hard stop, and as a sole that wears unevenly because the wrong part of it is taking the load. Neither is dangerous on its own; both make a player slower to trust their footing, which is the part that matters.
Where a sole actually dies
Not evenly. Wear concentrates under the ball of the foot, where the shoe pivots, and along the medial edge, where it is dragged. A sole with tread left across most of its area can be finished at those two points, and it is worth looking there rather than at the overall pattern.