- Crewneck t-shirt without sleeves, design 834T4 from GERONIMO Basic underwear collection. It is made of Microfiber with contents 80% Polyamide and 20% Lycra. This is an extremely soft and delicate fabric, quick drying, wicking moisture away, underlining men's body shape. You may choose among seven different colours, satisfying your fundamental underwear needs. The additional decoration of thin elastic at the side seam is in accordance to the different colours of this T-shirt is offered. Perfect for everyday wear, gym wear, and loungewear.