Saucony ProGrid Omni 9 Size Guide UK: Unisex, Men’s and Women’s Fit

The Saucony ProGrid Omni 9 is a unisex trainer that uses Saucony’s men’s-based UK sizing. Men can begin with their usual Saucony UK size. Women should generally choose half a UK size below their usual Saucony women’s size—for example, women’s UK 8 corresponds to unisex UK 7.5 on Saucony’s current Omni 9 chart.

That label question needs answering before “true to size” means anything. A women’s UK 8, a men’s UK 8 and a US 8 are not interchangeable references. First identify the scale, then check whether the shoe itself holds your heel and forefoot properly.

How does Saucony unisex sizing work on YIODesigner?

YIODesigner lists the Silver Mutant and OG Black Silver as Unisex. The numbers in their selectors are still Saucony men’s-based UK sizes; “unisex” changes the audience classification, not the number printed on the shoe label.

Saucony’s current UK ProGrid Omni 9 OG page classifies the model as unisex and states that its unisex sizing is the same as men’s sizing. That is a labelling rule: it does not, by itself, prove how the shoe’s width or heel will suit a particular foot.

What ProGrid Omni 9 size should a woman buy?

For Saucony’s official UK unisex Omni 9 chart, women are told to select half a size below their normal women’s UK size. Read that carefully: it is a UK half-size adjustment on this Saucony product chart, not the familiar US men’s-to-women’s conversion repeated across the internet.

For example, Saucony places women’s UK 8 beside men’s/unisex UK 7.5. Use this table only when your “usual women’s size” is a properly fitting Saucony women’s size or is supported by your foot measurement. If it comes from another brand, start with the current Saucony chart rather than carrying the label across unchanged.

How does a Saucony unisex UK 8 convert?

Saucony’s current chart maps unisex UK 8 to men’s US 9, EU 42.5 and JPN 27 cm. Its UK Omni 9 table places that same men’s-based unisex size beside women’s UK 8.5.

That row belongs to Saucony. Do not combine its UK number with the EU or centimetre column from Nike, ASICS or another brand. The YIODesigner Sneaker Size & Fit Guide explains why apparently identical UK labels can map differently.

Does the ProGrid Omni 9 fit true to size?

The safest starting point is your chart-matched Saucony size; YIODesigner does not have a controlled fit test that supports telling every buyer to size up. Saucony’s current lifestyle Omni 9 page provides its unisex chart but does not give every shopper a blanket half-size-up instruction.

Begin with the unisex size indicated by Saucony’s chart, then compare another size only when you can identify what feels wrong. Toe contact, side pressure and heel lift are different problems; they should not be collapsed into one verdict.

Why the Omni 9’s construction matters to fit

Saucony describes the ProGrid Omni 9 as a model launched in 2010 and now returned as a lifestyle shoe. The current OG product page lists an open mesh upper, rubberised cage overlays and GRID cushioning. Those are useful construction facts; Saucony does not state on that page that this release contains an engineered TPU shank or specify a separate heel-counter technology.

The mesh and the overlays should not be treated as if they will behave identically. If a firm overlay presses directly on the widest part of your foot during an indoor try-on, do not assume ordinary break-in will change the shoe’s underlying shape. Compare the pressure in another size and check that any extra length does not introduce heel slip.

Should wide feet go half a size up?

Only when the larger size fixes the pressure without creating a second problem. If your little-toe joint is tight but you already have clear space beyond the toes, the issue is width or shape—not automatically length. Half a size up may add enough room, but it can also loosen the heel and shift the flex point forwards.

What if you are between two Omni 9 sizes?

If your measured foot length sits between two Saucony chart rows, the larger size is generally the safer first comparison when the product page gives no different instruction. A shoe that is physically too short cannot be corrected with lacing.

Do not keep the larger size merely because it removes side pressure. Walk, turn and stop indoors. If your heel repeatedly rises or your foot slides towards the front, the extra length is working against you. In that situation, compare another silhouette with a roomier shape.

Do the Silver Mutant and OG Black Silver fit differently?

YIODesigner presents both as unisex ProGrid Omni 9 trainers. The Silver Mutant uses a silver and grey base with brighter accents, while the OG Black Silver has a darker palette. YIODesigner has not recorded a controlled fit comparison proving that one colourway runs larger or smaller.

Use the same Saucony men’s-based unisex chart as the starting point for either pair, then check the physical label when it arrives. Different Omni 9 editions can use different material treatments, so a sizing conclusion from a suede, premium or collaboration release should not automatically be transferred to these two YIO listings. Until YIODesigner measures and compares the actual stock, do not claim that the colourways have identical internal proportions.

How to test the fit before keeping the pair

Try both trainers on a clean indoor floor with the socks you expect to wear. Settle your heel at the back, lace with even tension and walk for several minutes. A good fit should feel controlled without requiring your toes to grip the shoe.

• Your longest toe should remain clear when you walk and stop.
• Your forefoot should sit over the broadest part of the sole rather than spilling painfully over its edge.
• Your heel should move with the trainer instead of lifting on every step.
• The cage and laces should hold the midfoot without numbness or a sharp pressure line.
• The shoe should bend around the ball of your foot rather than folding hard into your toes.

Buying the ProGrid Omni 9 from YIODesigner

Choose between the colourful Silver Mutant and the more understated OG Black Silver, then check the live selector for current availability. Both also appear in YIODesigner’s trainers under £100 collection while they meet that collection’s price and stock rules.

Keep the box, labels and soles in their original condition while checking the fit indoors, and read the YIODesigner returns policy before wearing the pair outside.

Quick answers about ProGrid Omni 9 sizing

Does the Saucony ProGrid Omni 9 run small?

There is no reliable universal “runs small” verdict. Begin with the size indicated by Saucony’s current chart. Compare another size only if the chart size is short or creates a clearly identified pressure point.

Is ProGrid Omni 9 unisex sizing the same as men’s?

Yes. Saucony’s current UK ProGrid Omni 9 OG page states that its unisex sizing is the same as men’s sizing. YIODesigner uses that men’s-based UK scale while classifying the products as unisex.

What men’s/unisex size corresponds to Saucony women’s UK 8?

Saucony’s current UK unisex Omni 9 table pairs women’s UK 8 with men’s/unisex UK 7.5. Treat that as Saucony product-specific guidance, not a universal conversion for every brand.

Should I size up for wide feet?

Compare half a size up if the chart size pinches across the forefoot. Keep it only if the added length still gives secure heel hold and places the flex point correctly.

The practical verdict

Read the YIO listings as unisex products using Saucony’s men’s-based UK scale. Women should generally begin half a UK size below their usual Saucony women’s size. After that, let the pressure point guide the next comparison: toe contact suggests length, side pressure suggests width or shape, and repeated heel lift suggests too much room.

Sources checked 4 September 2026: Saucony UK’s ProGrid Omni 9 OG product and unisex sizing table and Saucony’s footwear conversion chart. YIODesigner product classification in this article assumes the two product pages and Merchant Center feed have first been changed to Unisex. Product labels, stock and manufacturer charts can change; check the live pages before ordering.