At Cosi London, every piece is crafted from natural fibres chosen for their softness, safety, and incredible comfort.
Our merino wool and organic cotton blends work beautifully across both our baby collection and adult home range — each with their own unique “superpowers”.

Below, you’ll find everything you need to know about our materials and how to care for them so your Cosi pieces stay beautiful for years to come.

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The Merino Effect — Nature’s Comfort Superpower

100% Extra-Fine Merino Wool (Baby Collection)

Our baby hats, mittens, and blankets are made using pure extra-fine merino wool — one of nature’s most gentle and protective fibres.

Why it’s perfect for newborns:

Ultra-soft and itch-free

Naturally breathable

Regulates body temperature

Helps keep babies warm without overheating

Hypoallergenic and kind to sensitive skin

Odour-resistant and stays fresher for longer

Lightweight, cosy, and naturally stretchy for comfort

Merino’s ability to respond to changes in temperature makes it ideal for little ones who can’t regulate their own body heat yet.

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Merino & Organic Cotton Blend (Adult / Home Collection)

Our adult blankets use a soft, breathable blend of 15% merino wool and 85% organic cotton — perfect for everyday comfort in the home.

Why this blend is special:

Soft, breathable, and warm — without being heavy

Durable and long-lasting

Gentle on all skin types

Suitable for year-round use

A natural and sustainable alternative to synthetic fibres

Easier to care for while still offering merino’s natural comfort benefits

This blend brings together the cosy warmth of merino with the lightness and durability of organic cotton, making it ideal for sofa throws, bed blankets, and moments of calm at home.

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💚 Our Natural Fibre Philosophy

We choose natural fibres because they offer comfort that synthetics simply can't match.
They are:

Renewable

Biodegradable

Gentle on skin

Better for temperature control

Kinder to the environment

Every Cosi piece is designed to feel like a hug in a box — a moment of comfort you can wrap around yourself or someone you love.

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Care Guide — Looking After Your Cosi Pieces

Natural fibres last beautifully when cared for correctly.
Here’s how to keep your merino and cotton-blend items feeling soft, fresh, and cosy.

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Care for 100% Extra-Fine Merino (Baby Items)

Hand-wash or machine wash on a very gentle delicate/ wool cycle

Use cool water

Use a mild wool detergent

Do not tumble dry

Dry flat on a clean towel

Reshape gently while damp

Avoid hanging (this may stretch the fibres)

Pilling is natural with merino — it can be easily removed with a wool comb

Merino doesn’t need frequent washing — often, a gentle air-out is enough.

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Care for Merino & Organic Cotton Blend (Adult Blankets)

Hand wash or Machine wash on a very gentle delicate/ wool cycle

Cool or 30°C water

Use a mild, non-bio detergent

Line-dry or flat-dry

Avoid excessive heat

Do not bleach

Store folded, not hung

This blend is naturally breathable and durable, perfect for everyday home use.

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General Care Tips for All Natural Fibres

Allow items to air between uses

Store in a dry, cool place

Use cedar balls or lavender sachets to protect from moths

Avoid washing too often — natural fibres stay fresh longer

Keep away from direct heat sources

With the right care, your Cosi pieces will stay soft, beautiful, and comforting for years.