Wood Underwear Wood Boxer Brief Comfortable, non-binding waistband, plush against skin. Super soft - 48% modal (spun from beech tree cellulose), 48% cotton and 4% elastane. This fabric blend is ultra-comfortable. Has some wicking properties. Performs well for even the longest day's wear and washes up easily in the machine with like colors. Boxer brief (about a 3" leg).