I wouldn't buy one from Wish...too risky, IMO. It needs to be 100% wool and I just wouldn't trust it.
Look into a western saddle pad. 100% wool, 1/2" thick and way bigger than anything you're going to get from a quilt shop for 1/4 the price. Mine works great and I cut it in half and gave the other half to a girlfriend.
Check this one out. Read the comments. They also have a 30% off coupon today.
wool pad
Watson