a light fabric that feels almost weightless幾乎沒有重量的輕薄織物

She floated in the pool, weightless.她輕飄飄地浮在泳池裏。

The astronauts are living in a weightless environment. [=an environment in which people and things float because they are not affected in the usual way by gravity]航天員們生活在失重的環境裏。