State CashmereMen's Essential Crewneck Sweater 100% Pure Cashmere Classic Long Sleeve Pullover

Why all the different prices for the same sweater? As a Prime customer this price non-sense (as much as $35 dollars difference) does not set well.

Do the band and the cuffs have elasticity, do they spring back into shape?

Is this 100% goat cashmere?!!

The sizing is all wrong, please correct it. a us medium is not 20.9 inches chest, etc. what is the correct sizing?