Reebok - Women's Nano X4. Color Black/Grey/Pewter. On sale for $139.99. MSRP $150.00.. 4.3 out of 5 stars+5Brand NameReebokProduct NameWomen's Nano X4ColorBlack/Grey/PewterPrice$139.99MSRP: $150.00Rating4Rated 4 stars out of 5(54)