Sio is a stiffened polyester vane fabric sold in two UK shops as a vertical blind. Both retailers list the same name, and the pricing rises at a similar rate as window width and drop increase - a strong sign that the fabric being cut and hung is likely the same wholesale cloth.

If it is the same material, a few things follow for the buyer. The fabric quality, opacity, and how the vanes handle in day-to-day use should be comparable regardless of which shop you order from. What actually differs is the colour range each retailer carries and, ultimately, what each charges for your exact window size.

On colour, the contrast between the two shops is real. One carries two neutrals - Stucco and Charcoal - which between them cover most of the off-white-to-dark-grey range suited to a contemporary interior. The other stocks those two plus Pastello and Rosa, giving buyers who want a warmer or softer tone an additional option not available at the first retailer.

Vertical blinds are the practical choice for wide windows, patio doors, and conservatory openings where a roller or roman would be impractical to operate. The 89mm vane width is standard for residential use; the linked bottom chain keeps the vanes aligned during rotation and stops them swinging individually in a draught.

Both shops offer standard fitting only, so fitting method is not a differentiator here. The decision comes down to which colours match your scheme and which retailer is cheaper at the exact width and drop you are ordering - not the headline from-price, which typically reflects the minimum-size blind. Use the price cards below to compare at your actual window size before deciding.

Lowest at 1600×1200 mm: Blinds By Post at £96.00. Enter your own size below to compare at the window you are buying.

Prices below are for a 1600×1200 mm window. Enter yours to re-rank - we round up to the next standard size, as the retailers do.

We match these on the shared name and a price that scales the same way across window sizes, not an independent inspection, so treat it as likely the same fabric rather than confirmed. Construction, exact colourway and fitting can vary between retailers - check the specification at each before buying.

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