Stay warm this Winter with this HOT Old Navy deal! They have their Long Sleeve Thermal Tees on sale for $4 (Reg. up to $13)! And, you can even use code ENJOY at checkout to save an extra 10%! PLUS, if you sign up for the Old Navy email newsletter, you get a unique code for 30% OFF which you can combine with the 10% OFF, too! Stock up on thermal tees for the whole skill.with this deal!