I can't really think of a specific product but for me gels, thick butters and balms work.
Aloe vera gel - the best for me because it doesn't leave my hair hard or coated
Ecostyler Blue - Soft flexible hold and keeps curls clumped together.
Fantasia IC Gel - Same reasons as Eco Blue
Homemade flax seed gel
Shea Moisture Curl Enhancing Smoothie - Keeps curls moisturized, less frizz
Not all products work for everyone. You have to see what works for you.
APL BSL MBL WL HL TBL | porous, fine/medium strands, medium density My Fotki!
Below: Typical PS bun