Parnica What to Pack

Clothing/Shoes/Weather Gear: Comfortable walking shoes preferrably water-resistant: like good trainers or better special walking shoes (Danish Ecco are very comfortable and... expensive but worth the cost).
Sun-glasses esp. in winter and summer and always a rain coat.

Read info on climate in Slovakia:
Climate of Slovakia

Check 10-day weather forecast for Sliac (97 km south of Parnica): Weather forecast for Sliac Region
Check weather (4-day forecast) for Dolny Kubin (8 km east of Parnica, in Slovak language):
Weather forecast for Dolny Kubin
Remember that the weather changes very fast in this mountaineous area!

Toiletries and Medical Supplies: Toilet paper, soap (small bottle of liquid soap), paper towels or tissue papers. Usually available in public toilets (restrooms) but... not always.

Photo Equipment: For pictures at night and bad light (weather) take a tripod.

Miscellaneous: If you are going to climb the mountains buy good map of the area, detailed with mountain trails marked. There are maps covering whole Slovakia by VKU (Vojensky Kartograficky Ustav) which are numbered (area by area) and the best in my opinion. Available in bookstores in Dolny Kubin/Zilina and sometimes (rarely) in bigger petrol/gas stations.