Mens BOSS Kieran Rubber Outsole Trainers Versatile enough for everyday wear these BOSS Menswear trainers have a discreet low profile. Soft suede combines with a springy rubber outsole and subtle branding. - Laces - Fully lined - Box - Upper material: 100% Cow skin. Lining: 85% Polyester 15% Polyurethane - 60% Polyester 40% Polyurethane. Sole: 100% Rubber. Innersole: 100% Polyester. - Ref: 50541868-342, Material: Suede.