Эта майка из хлопка, поэтому в ней не жарко даже днём.

This tank top is made of cotton, so it isn’t hot in it even during the day.

Breakdown of Эта майка из хлопка, поэтому в ней не жарко даже днём.

• в: in
• не: not
• этот: this
• жаркий: hot

Questions & Answers about Эта майка из хлопка, поэтому в ней не жарко даже днём.

Why is it эта майка and not этот майка?

Because майка is a feminine noun in Russian, and the demonstrative this must agree with it in gender.

• masculine: этот
• feminine: эта
• neuter: это

So:

• эта майка = this shirt / this tank top

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What exactly does майка mean?

Майка usually means a light upper-body garment such as a tank top, undershirt, or sometimes a casual T-shirt-like top, depending on context.

It is not the most general word for shirt. For example:

• рубашка = shirt, especially a button-up shirt
• футболка = T-shirt
• майка = tank top / sleeveless top / undershirt

So here майка suggests a light piece of clothing, which fits well with the idea that it is not hot to wear.

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Why is it из хлопка and not из хлопок?