The Classic PPO is a traditional preferred provider organization medical plan. That means you meet a deductible first, then the plan pays a portion of the cost until you meet your out-of-pocket maximum. At that point, the plan covers 100% of remaining eligible expenses.
The deductible is lower than for the HSA and HRA options, and there’s no deductible for prescription drugs (those have a copay from the get-go). But with the PPO, you pay more from each paycheck.
The Class PPO’s higher paycheck contributions are only worth the cost if you can’t afford to meet the HSA or HRA deductible—minus any money you get from XPO.