The Neotech Support Harness can alleviate pressure on the back, shoulders and neck. It can be especially useful if you’re suffering injuries. It can also be used while sitting down.
The website lists the strap for $135, but Amazon has it listed for ~$80. Even with the Amazon discount, it’s still very pricey. I would personally value the product at around $25. With that being said, I haven’t seen a competing product yet.
