Modulus measures the resistance to stretch. This calculation is the amount of pull required to stretch the material to 500% elongation (given in megapascals). The lower the modulus rating, the softer the glove feels to the wearer. If a glove is less resistant to stretch, it is less fatiguing to the hand. The ASTM establishes the maximum requirements for modulus in medical gloves. Latex examination gloves must conform to physical requirements of ASTM standard D3578. Modulus requirements for a latex examination glove are 5.5 MPa at 500% elongation. A low modulus glove is softer and easier to stretch and flex, whereby a high modulus glove is harder to move and stretch.