Heartcosy Grade 6A Mulberry Silk Comforter – Organic Cotton Shell, All-Season

The benchmark for silk comforters — built to a standard, not a price point.

At $289.99, this is Heartcosy's flagship silk comforter. The 
premium pricing reflects two choices that most silk duvets at 
this level don't make simultaneously: Grade 6A mulberry silk fill 
and a certified organic cotton shell. Both materials. No compromise.

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The fill: Grade 6A Mulberry Silk

Grade 6A is the highest commercially graded mulberry silk —
assessed for fiber length, luster, strength, and cleanliness.

What this means in practice:
· Longer, more continuous fibers that resist clumping
· Higher natural luster — the fill looks and feels richer
· Greater tensile strength — the fill holds its structure 
  over years, not just months
· Naturally breathable fiber structure that adapts to body 
  temperature across seasons

Fill weight: [Confirm: e.g. 1800g King / 1500g Queen]
Suitable for: [Confirm season weight — all-season / winter]

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The shell: Organic Cotton

Shell: 100% organic cotton — [confirm: Australian long-staple 
       cotton / GOTS certified if applicable]

Long-staple cotton produces a finer, smoother yarn than 
standard cotton. The result is a shell that feels substantial 
without being stiff — and holds up to long-term use without 
pilling or thinning.

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Certification

[If OEKO-TEX Standard 100 confirmed:]
OEKO-TEX Standard 100 certified — both fill and shell 
independently tested and verified free from harmful substances.
Certificate number: [insert if available]

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Temperature regulation

Silk's natural fiber structure — approximately 38% air void 
by volume — allows heat and moisture to move through the fill 
rather than building up underneath. The duvet responds to your 
body temperature rather than maintaining a fixed warmth level.

Warmer in winter when your body needs insulation.
Cooler in summer when it needs ventilation.
The same duvet, adapting to both.

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Construction

· [Confirm fill layering method — hand-stretched / machine-layered]
· Anchor stitching — fill stays evenly distributed after washing
· [Confirm: duvet loops / security ties at corners]
· [Confirm: silk inspection window if present]

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Care

· Recommended: dry clean
· If hand washing: cool water, gentle silk detergent, 
  do not wring or twist
· Air dry flat in shade — do not tumble dry
· Use a duvet cover to protect the fill and extend product life
· Store in breathable cotton bag — avoid plastic compression bags

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Available sizes: Twin · Full/Queen · King

Select your size above.