Consider this, if you are supposed to replace your PFD every 5 years, and you spend $20 on one of these:
https://tinyurl.com/ybp4db3w
Every 5 years you will get a new, certified, safe and comfortable PFD, and over 25 years you will only spend $100.
Your "quality" Zhik PDF will cost you $600 and it is NOT even coast guard approved.