コルクボルスター

Finally, a cushion that actually stays firm without being heavy—the cork material contours perfectly during longer sits. The recycled filler makes it surprisingly lightweight to carry from room to room.

Been using this every morning for knee-supported breathing and it doesn't slide around on my wood floor like my old cotton one did. The cork surface warms up fast and has just enough give under my sit bones. Light enough to carry to class too.

Wasn't sure cork would feel soft enough for long sits, but it contours to my lower back better than my old foam block ever did. It's noticeably lighter too, so I can carry it to class without my bag getting heavy.