These form-fitting trunks are designed with comfort in mind. No center back seam, a reinforced inseam gusset and a shaped front cup make these boxers fit like a second skin without the worry of rubbing or shifting. Short, athletic legs and a smooth elastic waistband create a streamlined silhouette that can be worn under everything from slim-fit pants to gym shorts. Skill level: Adventurous Beginner. Sizing: Regular Size: 24 – 36 and Plus Size: 39 – 45 For sizing, yardage requirements & finished garment measurements, click here. Fabric suggestions:Cotton, bamboo, or blended lightweight knit with (preferably) at least 4% spandex/elastane and four-way stretch. The knit you choose should have 60 – 70% stretch. For sporty, versatile trunks, choose a lighter weight knit. For thicker, cosier trunks, choose a heavier T-shirt weight knit. Avoid tissue weight knits as these will not be strong enough.