Liyue is a warm paste brand registered by Qingdao Yajie Technology Co., Ltd. in 2012, mainly sold in online channels. Liyue warm paste uses high-purity reduced iron powder, which has the characteristics of high temperature and fast heating, but the heating stability is slightly poor, and there may be sudden cooling and sudden heating, although the nominal continuous heating time can reach 10 hours, the actual heating is only about 8 hours, and the temperature is concentrated at about 40 °C. This is also a common problem of domestic warm stickers: the oxygen permeability of non-woven bags is too fast, and the temperature rises quickly but is not durable and unstable.
 
Liyue warm stickers are divided into rectangular warm stickers, foot warmers, foot warmers and knee warmers, each knee warmer is about 3 yuan, and other styles are only about 0.5 yuan per piece. The knee warmer is butterfly-shaped, slightly longer in length than the rectangular warmer, but the heating element is not divided, and there will be bending when it is wrapped on the joint, and the fit is slightly worse. In addition, many of Liyue's products have powder leakage and bag falling when they are used, and the overall comfort is poor.