Watermelon is a traditional summer treat in China. And now there's a handy hot-selling gizmo that lets users slice the entire fruit into several sections with a single motion, becoming among the top-three items sold on Taobao this summer, going for around 10 to 50 yuan a pop.

Seat cushions and throw pillows that can be filled with cool water are also selling like hot cakes, as well as body patches that claim to repel mosquitoes.

One of these cushions retailing for 115 yuan on JD.com got top ratings from some 150 satisfied－and presumably cool－buyers who left comments on the platform. Some 16,000 anti-mosquito patches were sold on an average day in June, according to Taobao.