saddle blanket
韉 centers on a saddle blanket, the padded cloth placed under a saddle for the horse's comfort.
韉 combines 革 (leather) with 薦, which likely contributes the sound and the idea of something placed underneath, as 薦 can mean to recommend or to present, suggesting a mat or cushion laid down.
革 (leather) on the left hints at animal hide, and 薦 on the right looks like a mat spread out. Picture a leather mat placed under a saddle: that's the saddle blanket.
For セン, imagine a cent (coin) being placed under the saddle as a makeshift blanket: cent -> セン, and the leather mat cushions the ride.