What does a half pad do, and when do I need one?

Horse & Rider (UK), in its gear guide, says riders usually reach for one to fix a fit problem, such as a saddle that slips, sits unevenly or no longer suits the horse's shape across the seasons. It lists shock absorption, anti-slip properties, breathability and fit correction as the main benefits. Wikipedia's description is plainer: small, contoured pads used for temporary saddle fit adjustments, with some riders also using them for extra cushioning or to reduce slipping.

Notice the word temporary, because it changes how you think about buying one. Wikipedia says that once the horse is properly muscled, the saddle should be refitted and the pad removed.

A half pad is a different piece of kit from a saddle pad. Wikipedia describes the saddle pad, or numnah, as thicker, usually layered with felt, foam or newer materials, and the half pad as shorter and shaped. For the pad that goes over it, see our Saddle Pad Guide and our close contact or general purpose pad page.

Wikipedia says a pad or blanket cannot replace a properly fitted saddle, and that pads with shims can only partially compensate for minor fitting problems. Horse & Rider's guide says half pads can dramatically change the fit of your saddle, so the wrong one could cause your horse significant discomfort, and it says to work closely with your saddler and follow their advice before you buy one.

That's a reasonable order of operations. Have a saddle fitter look at the saddle on your horse first. If they recommend a half pad for a particular reason, such as a horse changing shape through the seasons, ask them which type and how thick, and have them show you what to look for with the pad on and off. Horse & Rider also suggests having the saddle checked by a qualified saddler every six months, and telling them about any change you see in the horse or in how he goes.

If your horse has uneven muscling, the same guide recommends a vet check to rule out veterinary causes. We can't diagnose a back problem, and a pad can't either. Your vet and your fitter can.

Here is that breakdown, with the cautions it gives for each. Maker examples are the makers' own descriptions.

Horsena, for example, sells gel pads in four profiles: Regular, Slim, Front Balance and Back Balance. It lists its Regular Jump Gel Saddle Pad as an 8 mm half pad and the Slim as 4 mm, with the Back Balance ramping from 8 to 23 mm to raise the cantle and the Front Balance running 23 to 8 mm. It describes its gel as hypoallergenic and says the pads use a hexagonal 3D structure of open cells. See the range on our Horsena page.

T3's Shim Pro Impact half pads have three internal pockets on each side of the spine and come pre-filled with two quarter-inch shims for a total of twelve. They go over any lightweight quilted saddle pad. T3's Matrix half pads add an elongated front that extends over the shoulder rather than bisecting it. See T3 half pads. Equine Innovations' Riser Plus pads are an add-on that adds lift to a standard therapeutic pad, and the maker says they level the saddle and free the shoulders. See Equine Innovations. All three are the makers' claims, and we haven't tested them.

A note on thickness, since you'll see millimeters in the descriptions. A thin gel pad and a thick riser pad do very different jobs. If a maker's description doesn't say which job a pad is meant for, ask before you buy.

Horse & Rider says fit-correcting pads suit unevenly muscled horses until muscle develops, and to look for a range of shim thicknesses. It also says the saddle's fit should be monitored while you use any pad, with changes reported to your saddler.

Don't over-do it. Toklat says its shim pad is not meant to use all twelve shims at once, and that if you need that many, its regular T3 half pad is the better fit. That's a useful rule of thumb: if you're stacking every shim a pad comes with, the pad isn't the answer. It's a reason to call the fitter back.

A rider's comment below makes the practical point more simply.

They are worth knowing, because they tell you what the pad is for. Here they are, with what to do about each.

• The horse's weight changes through the year. Horse & Rider describes fleece-lined pads as good for horses who lose condition over winter. Your fitter can tell you whether one suits yours.
• The horse has uneven muscling. Shims are the usual tool, until muscle develops, and a vet check can rule out other causes.
• The pommel or cantle sits too low. A riser is made for this, and the guide cautions that too much thickness tips the saddle the other way.
• The horse has a sensitive back. Horse & Rider describes gel pads as good for sensitive backs. Your fitter should still check the saddle.

The first is answered above: a half pad changes fit and feel, and some riders use one for cushioning or grip. For the second, see the shims section. The third is a good question for a saddle fitter, because the answer depends on the saddle and each horse.

If you're shopping for a rider who already uses one, check which type she has and what size her saddle is before you buy. A gel half pad, a fleece-lined one and a shim pad are different things, and the right one for her depends on her horse.

Horse & Rider lists several cautions. Check that the knee roll doesn't press on the horse's shoulder and lift the pommel, which would drop the cantle. Full fleecing can narrow the gullet and press on the spine and withers, so look for a center channel. An overly thick riser can tip the saddle the other way. And our own Saddle Pad Guide makes a related point: a very thick pad can raise the saddle and change its fit, and if no pad seems to work, have the saddle fit checked on its own.

Ask your fitter to look at the whole set-up with the pad on, girth included. Our girth sizing page covers how to measure with the saddle on.

Whatever you choose, follow the maker's care instructions. Horsena, for example, lists a 30 degree machine wash for its gel pads, and T3's Matrix half pads are listed as machine washable. Pads vary, so go by the label.

Others are made to sit directly under the saddle. Check the maker's instructions for the pad you have, and ask your saddle fitter how it should layer with the rest of your set-up.

We don't have a source on whether a half pad will keep your saddle from moving, and we'd rather not guess. If slipping is the problem, a saddle fitter is the one to ask.