Or this.
https://www.amazon.com/Yoleo-Inversion-Adjustable-Headrest-Protective/dp/B07DP51MRR/ref=sr_1_1_sspa?ie=UTF8&qid=1547211688&sr=8-1-spons&keywords=ez-up%2Bgravity%2Bboots&th=1
https://www.amazon.com/Yoleo-Inversion-Adjustable-Headrest-Protective/dp/B07DNXQL6P/ref=sr_1_1_sspa?ie=UTF8&qid=1547211688&sr=8-1-spons&keywords=ez-up+gravity+boots&psc=1