Slacks implies pants of certain materials which are not part of a suit (jeans are not slacks, and you would not refer to the pair of trousers that came with a suit as slacks.) It is also more common to use slacks to refer to pants worn by women, while men would wear trousers.
Health care safety net providers are those that have a legal mandate or mission to offer medical care to all patients, regardless of their ability to pay, and have a substantial number of patients who are uninsured or on Medicaid.
The captive enters into a reinsurance agreement with the medical stop-loss insurer that transfers responsibility for payment of claims that exceed the deductible amounts accepted by each employer up to a preset cap, usually somewhere between $250,000 and $500,000 per plan participant.