We, Shandong Changyuan Footwear Co.,Ltd., as an experienced manufacturer of indoor slippers and safty shoes. The main workmanship for our safety shoes is dual density PU injection approved with CE EN345- S1, S1P & S3.   For more information of our company and products, pls visit our web site, . Im sure you of our prompt reaction to your feedback. And more information, as sample pictures, will be forwarded to you on receipt of your further inquiry. Looking forward to your further information. And many thanks for your kind attention on our message and best regards to you! Sincerely yours, Peter Tsui