GILDAN – UNISEX HEAVY BLEND CREWNECK SWEATSHIRT – 18000(Adult) & 18000B(Youth). GILDAN – UNISEX HEAVY BLEND HOODED SWEATSHIRT – 18500(Adult) & 18500B(Youth). The Heavy Blend collection is now made with finer yarns and new MVS Air spinning technology, that improves the fabric by reducing pilling, enhancing durability and creating a smoother printing surface.