The question we hear most about the Gharsha bottle by Thrr (ذر) — a handmade clay water bottle from the Saudi design brand Thrr in Riyadh — is: “Does it cool the water?”
The short answer: no. The long answer is this article, because the difference between a Gharsha and a traditional clay jar (jarra or zeer) is worth knowing before you order either.
How does a clay jar cool water in the first place?
An unglazed clay jar has a porous wall. Water seeps slowly from the inside to the outer surface and evaporates there. Evaporation pulls heat with it — the same reason you feel cold stepping out of a pool. That's why water in a clay jar is cooler than the air around it, especially somewhere with a breeze.
But that cooling has a price: the jar “sweats”. Its surface is always damp, it needs a dish underneath, and you can't carry it in a bag or put it in a car cup holder.
Why doesn't the Gharsha cool?
The Thrr Gharsha is made of two layers: natural clay on the inside, touching the water directly, and a glaze on the outside — a glassy layer fired onto the surface. The glaze seals the pores, so no water reaches the surface, there's no evaporation, and so no cooling.
That's a deliberate decision. The Gharsha is made to be carried: in the car cup holder, in a bag, on a desk — without wetting anything around it.
So what's the point if it doesn't cool?
Taste. Plastic leaves a trace in the taste of water after a few weeks, and metal leaves another. Fired clay is an inert material — the water touches clay, not plastic, so it stays clean-tasting, like water from a traditional clay pot.
Fill it with cold water from the fridge or room-temperature water, and drink from it all day.
Gharsha vs. clay jar: a quick comparison
- Cooling: an unglazed jar cools by evaporation. The Gharsha doesn't cool.
- Portability: the jar stays at home. The Gharsha is carried in one hand and fits a cup holder.
- Surface: the jar is always damp. The Gharsha is dry on the outside.
- What touches the water: clay, in both.
- Capacity: the Gharsha holds about 400 ml.
Honestly — the Gharsha's limits
- It isn't a thermal flask. Water drifts to air temperature over time.
- For cold and room-temperature water only.
- No freezer, no microwave — sharp temperature changes crack clay.
- Hand-wash only, with a mild unscented detergent — clay holds strong smells.
- It breaks if dropped. It's real clay, which is exactly what makes it not plastic.
- Every piece differs slightly in colour — the glaze is affected by where the piece sits in the kiln.
Who is the Gharsha for?
For anyone who drinks water all day at the office or in the car and is tired of the taste of plastic. If you want ice-cold water at midday, the Gharsha isn't for you — get a thermal flask. We'd rather you know that now, before you open the box.
The Gharsha is designed by Thrr, a Saudi design brand founded in Riyadh in 2015 that makes gifts and everyday objects inspired by Saudi culture.
See the Gharsha colours — delivered within 36 hours in Riyadh, and damage in transit is on us.