Gymphlex Gymphlex M size Walnut buttons Retail price: 15,000 yen or more A classic boa vest from Gymphlex. It's lightweight and perfect for both everyday wear and outdoor activities. The distinctive round walnut buttons on the front keep your neck warm when fastened all the way up, and the design allows you to enjoy a three-dimensional silhouette that highlights the volume of the hood. The Griffin mark embroidery is on the left chest.