Yes… What you think is correct. When you swim in cold water you may think to have warm weather to make you energetic to sail little more distance.
Rip curl wetsuit manufacturing company have woven wetsuit which will produce heat inside the water. This suit will keep you warm when you swim in the water. It is named as Wetsuit H Bomb.
It uses two rechargeable 7.4 volt Lithium-ion batteries to power up the H-Bomb Wetsuit. It’s kept on the internal pocket on the lower back of the suit. It will take 3 hours to recharge the batteries.
The current heat will be displayed by an indicator. It is available for around $ 1000 in the market.
For more details Rip Curl H Bomb

Who would want to carry a Hydrogen Bomb in her swim suit?
Crazy discovery and a real worth for people live in cold countries.
Bro… It won't explode.
@Arafat, You're absolutely correct.
That's a great innovation, any side effects/drawbacks?
Maybe It's not suitable for kids.