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420D vs 600D garden furniture cover: yarn, not a waterproof score

Updated: 22 October 2026

The title says 420D or 600D, and it is easy to treat the higher number as the drier cover. A 420D vs 600D garden furniture cover choice is about yarn thickness, the coating, and whether the centimetres fit. In this amazon.co.uk set from 19 October 2026, one listing is 600D, several are 420D, two say 500D, one round is PE, and one cube prints no denier. The rows are on the [garden furniture cover comparison](/hub/garden-furniture/garden-furniture-cover). Peter F. read those listings. This is not a laboratory test. A qualifying purchase can earn a commission at no extra cost to you.

The title says 420D or 600D, and it is easy to treat the higher number as the drier cover. A 420D vs 600D garden furniture cover choice is about yarn thickness, the coating, and whether the centimetres fit.

Our top picks

BEEWAY BEEWAY 200 × 160 × 73 cm

Best overall

BEEWAY BEEWAY 200 × 160 × 73 cm
7.6/10about £15.19
View offer
Aoretic Aoretic 180 × 120 × 74 cm

Best value

Aoretic Aoretic 180 × 120 × 74 cm
7.4/10about £6.79
View offer
PATIO PLUS PATIO PLUS round 130 × 71 cm

Rank 3

PATIO PLUS PATIO PLUS round 130 × 71 cm
6.0/10about £30.49
View offer
On this page
  1. 1.Denier is the yarn, not the water test
  2. 2.What the twelve listings actually say
  3. 3.When the heavier cloth is the point
  4. 4.When size beats denier

Denier is the yarn, not the water test

Denier is a yarn-thickness label. Liyang Chengyi, a mill that weaves Oxford cloth, describes 600D as thicker than 420D and more resistant to abrasion, and says water resistance depends on the coating. That note is not a UK trial of these ASINs. Shape comes first, on the garden furniture cover buying guide. Oxford here is a basket-weave polyester. The seller's water claim is a PU coating, a nano coating, a PVC lining or taped seams. CAP Code 3.7 is why this page will not call 600D waterproof. A heavier cloth can still rip. Sweat with no hole is not fixed by moving from 420D to 600D. That sits on the condensation page.

What the twelve listings actually say

420D is the common cloth: the 170 cm RICHIE at £19.98 and 520 g, the black Funshot at £20.99 and 400 g, Aoretic at £6.79 and 870 g, all three BEEWAY sizes, and AWNIC at £18.88 and 670 g. Only AWNIC prints 3500 mm H2O, with no method. 500D is two different weights. SIRUITON is 2.29 kg at £33.99. RICHIE's 200 cm 500D is £27.99 and 500 g, and buyers at 4.7 from 61 reviews expected more heft. 600D appears once: PATIO PLUS, 130 × 71 cm, £30.49, 1.39 kg, PVC-lined, with no hydrostatic head. Dokon's cube prints no denier. The green Funshot is PE at the same £20.99 as the black Oxford round.
BEEWAY BEEWAY 200 × 160 × 73 cm

Testsieger

BEEWAY BEEWAY 200 × 160 × 73 cm
7.6/10about £15.19
View offer

When the heavier cloth is the point

Buy the higher denier when the last cover split, the corners are sharp and the size already fits. Aoretic's reviews say the 420D cloth is too thin and tears. That points to PATIO PLUS or SIRUITON only if the shape matches, not to a 600D round on a rectangle. PATIO PLUS is the only 600D here, and a review says it tore after a few months. Harbour Lifestyle warns that a PVC lining traps moisture on wood and rattan. SIRUITON at 2.29 kg is the heavy square, not a 600D, and some of its 145 reviews still call the cloth thin.

When size beats denier

A 600D cover that does not fit is worse than a 420D cover that does. PATIO PLUS is a circle near 130 × 71 cm. On a 200 × 160 cm rectangle the chair corners stay in the rain. The best garden furniture cover page splits those jobs. AWNIC's 3500 mm line does not make every 420D row waterproof, and it does not turn a sofa cover into a dining cover. If the 200 cm BEEWAY matches your tape, that 420D row beats a £30.49 round that will not go over the table. Denier also does not settle a grey-versus-black colour field.

Common questions

What does 420D mean?
It is a yarn-thickness label on Oxford polyester. In this set it is the usual cloth, from Aoretic at £6.79 to AWNIC’s sofa cover. It is not a waterproof grade. The coating and the seams are the seller’s water claim, and we have not lab-tested them.
Is 600D always better?
It is a thicker yarn, so it should resist abrasion better than 420D, according to mill explanations of Oxford cloth. In this folder the only 600D is PATIO PLUS, a round cover at £30.49, and a review still reports a rip after a few months. Better against scuffs is not the same as better for your rectangle.
Does 600D mean waterproof?
No. The mill note used here says the coating sets water resistance. PATIO PLUS also claims a PVC lining, which is a separate sentence from the denier. There is no hydrostatic head on that listing. Do not read 600D as a passed soak test.
Does AWNIC’s 3500 mm figure make 420D waterproof?
It makes one seller claim on one 420D sofa cover, with no test method in the file. The other 420D listings do not print 3500 mm. RICHIE’s 170 cm 420D cover says waterproof in the bullets and water resistant in the specification row. Keep each sentence on its own ASIN.
Should I pay £30 for 600D if the size is wrong?
No. PATIO PLUS at £30.49 only covers a round set near 130 × 71 cm. If the furniture is a rectangle, a sofa or a 90 cm cube, the 600D round is the wrong shape. A closer 420D size, or the 500D square if you have measured near 250 cm, is the relevant row.

Related pages

How to fit a garden furniture cover

Garden furniture cover

Best garden furniture cover for the shape you have

Garden furniture cover buying guide: size and shape

Condensation under a garden furniture cover: causes

Sources

Public UK sources used for this comparison. Listing prices, stars and review counts are the amazon.co.uk lines captured on 19 October 2026. There is no laboratory test.

  1. Consumer Rights Act 2015, goods remedies (retrieved 19 October 2026)
  2. General Product Safety Regulations 2005 (retrieved 19 October 2026)
  3. BS EN 581-1:2017 outdoor furniture safety (retrieved 19 October 2026)
  4. BS EN 581-2:2026 seating tests (retrieved 19 October 2026)
  5. ASA CAP Code 3.7, objective claims (retrieved 19 October 2026)
  6. RHS, maintaining garden seats and tables (retrieved 19 October 2026)
  7. Harbour Lifestyle, furniture cover care (retrieved 19 October 2026)
  8. BBC Gardeners' World, outdoor furniture covers (retrieved 19 October 2026)