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Images: Decathlon Simond and its retailers. Used for product identification.

Decathlon Simond

Decathlon Simond MT900 10 °C Down

A 700 g summer down bag with lab-tested ISO ratings for under £100.

Weight
700 g
Comfort
+10 °Climit +5 °C
Packed
14 × 34 cm, 4.9 L

Best price found

£99.99

at Decathlon · Price from Decathlon's UK search listing

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Prices checked 31 October 2026. We may earn a commission on these links.

  • 800 FP down
  • RDS down

Specifications

Weight
700 g
Packed size
14 × 34 cm, 4.9 L
Comfort
Comfort +10 °C / limit +5 °C
Fill
800 FP down, 300 g fill
Shell & construction
not stated; X-shaped compartments, through-stitched
Rating Standard
ISO 23537 rating
Fill Note
300 g down/feathers in size L; RDS-certified down per UK listing
Season
2-season
Zip
Long left-side zip with double slider and anti-draught…
Manufacturer page →

Pros & cons

  • Very low weight and compact pack size
  • Good loft and warmth for a summer bag; comfort figure reflective of real-world warmth
  • Smart, well-designed details
  • Hood can feel confining; down performs poorly when wet
  • No left/right zip choice

Sources for this product

  1. 1Decathlon UK listing
  2. 2Decathlon UAE product data
  3. 3T3 review
  4. 4Decathlon Ireland newer version

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