Lucky Cotton Viscose Blend Boxer Briefs - 3 Pack (241PB32). The Lucky Cotton Viscose Blend Boxer Briefs - 3 Pack LUM241PB32 feel softer against the skin and have better breathability than regular cotton with a supportive contour front and tag-free interior. Lucky's Cotton Viscose Blend Boxer Briefs - 3 Pack is made of cotton/viscose.