According to a report on the 10 th anniversary of the US university map, a simple technology designed to detect the efficacy of a new respiratory mask, Duke designed to reduce the effectiveness of a new respiratory mask. Ideally, home-made masks should have two or three layers, but in the absence of any better choice, health authorities around the world have proposed the use of headscarves, scarves or neck covers as alternatives to masks. Unfortunately, not all types of mouth and nose covers are effective in reducing spray. In terms of reducing the amount of foam emitted by the speaker, the effect of knitted fabrics and scarves is particularly poor. But what really surprised the researchers was the results of the cashmere collar. The number of droplets penetrating the cashmere neck cover is similar to that emitted during the benchmark test without a mask. The study suggests that wearing such masks may ultimately backfire, creating a greater risk of transmission than not wearing them. However, this conclusion is still hypothetical, and this study does not clearly prove that cashmere neck sheath will aggravate the virus transmission. On the contrary, the study suggests that the often used adage “something is better than none” may not be right.