Don't get me wrong. I believe over thinking things is very good practice, up to a point. Been there and still do that. I took a major leap/risk on coffee this year with great results that I hope will be reproducible.

Commercial photography, architecture ... along with I'm sure many other professions have a saying about 90% of the job takes 10% of the time and the last 10% takes 90% of the time and/or budget. Over thinking, at some point lets you understand when it's time to cut your losses at good enough. After all, we're talking vacation time where efficiency, functionality and in this particular case, shortcuts to comfort, really matter to the end user.

I've not tried silk but other slippery things knotted me up or slid me to places where I was not comfortable. I find it much easier to 'wear the bag' as in let the bag turn with me TO the pad rather than me try to turn within the bag and stay on the pad. When trying to turn within the bag I'd always wake up cold, sore or both off the pad.