These books are self-published, he makes about $10 a book as they tend to fall under the 150 pages threshold. The flexible arm is extremely flimsy and wont stay up where I adjust it. Seems logical! I ordered a size up (11-12) as advised and they fit fine. I love how neat it looks and it is super sturdy! Again not the product fault just my lovely squishy ?? bodyNext time Ill try the thong version or a panty style cut if available from your company. Cant recommend them highly enough. Best product for the price. Heel and toe fit are good. Your calls are hear phenomenally, the callers hear you when you raise your voice very loud.